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"Bi" Vocabulary Words

Based on the definitions, guess these words that start with the prefix "Bi".
Quiz by Quizmaster
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Last updated: January 25, 2023
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First submittedMay 4, 2010
Times taken54,024
Average score65.0%
Rating4.10
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Definition
Word
Two-wheeled conveyance
Bicycle
Telescope for two eyes
Binoculars
One with two wives
Bigamist
Event which combines
skiing and shooting
Biathlon
Occurring every 14 days
Biweekly
200th anniversary
Bicentennial
Disorder previously known as
manic depression
Bipolar
Speaking two languages
Bilingual
To cut in two
Bisect
Type of mollusk
Bivalve
Definition
Word
Having two legislative houses
Bicameral
Glasses with different lenses for near and far
Bifocals
Tooth between the incisors and molars
Bicuspid
Supported by both Republicans
and Democrats
Bipartisan
Two-headed muscle of the upper arm
Biceps
Two-footed animal
Biped
Older aircraft with two sets of wings
Biplane
Number system using only 0 and 1
Binary
One attracted to either men or women
Bisexual
Like a trade agreement between
two parties
Bilateral
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100 Recent Comments
Remster
+10
Level 79
Jun 2, 2013
For info, the British word for a 200th anniversary is 'bicentenary'.
Quizmaster
+1
Level ∞
Jun 3, 2013
That one will work now. Thanks,
blizzrd33
+1
Level 80
Jan 26, 2023
Bicentennial is an adjective not a noun though, which is why bicentenary is the actual answer to the question.
MindWax
+1
Level 86
Mar 3, 2025
Google is free and a pretty nifty tool.

bi·cen·ten·ni·al

/ˌbīsənˈtenēəl/

noun

noun: bicentennial; plural noun: bicentennials

the two-hundredth anniversary of a significant event.

Salz
+4
Level 60
Jun 3, 2013
Can you accept bicentenary for bicentennial?
Susie222
+4
Level 59
Oct 18, 2013
More people knew about "bisexualism" than bicycles? Weird.
Sifhraven
+10
Level 73
Dec 19, 2018
Many maybe tried bike
wiifly
+6
Level 61
Mar 6, 2023
A. Bi is already a common abbreviation for Bisexual so it was in the forefront of many’s minds already

B. The Bicycle question was worded weirdly and wasn’t as immediately obvious as the bisexual question.

AshleyT
+6
Level 44
Apr 3, 2014
Would occurring every 14 days not be " bimonthly" ? Biweekly implies something is occurring twice a week ?
beetboy12
+1
Level 37
Jul 29, 2014
if something occurs on the 1st, 15th and 29th its is biweekly not bimonthly.
Bonzo65
+16
Level 72
Jan 27, 2015
The proper English word would be 'fortnightly' - nice and clear. Shame it doesn't begin with 'bi-'.
pkerr116
+5
Level 72
Jan 26, 2023
LOL fortnightly is clear?
tooch21
+5
Level 56
Mar 4, 2023
Fortnightly - occurring every FOURteen NIGHTs. Pretty straight forward and logical to me.
brandybuck96
+1
Level 83
Sep 28, 2023
it's clear if the word 'fortnight' is in your vocabulary, but it seems to be strangely absent from most Americans'
jamesd
+5
Level 68
Jan 10, 2016
Semi-monthly is twice per month, which is close to biweekly, but not the same. If you get paid semi-monthly, you get 24 paychecks per year. If you get paid biweekly, you get 26 paychecks per year.
Clark1
+2
Level 26
Mar 4, 2023
Absolutely.
blinky
+3
Level 58
Nov 21, 2016
Not at all. Biweekly means every two weeks. Bimonthly means every two months. I've subscribed to enough bimonthly magazines to know.
stubblyhead
+3
Level 75
Dec 14, 2016
Bimonthly can mean both! https://www.merriam-webster.com/dictionary/bimonthly
theenforcer22
+3
Level 68
Mar 4, 2023
To me bi-weekly is twice per week, so I agree. Every 14 days is fortnightly.
escojm
+1
Level 62
Apr 29, 2014
Twice a week would be semi-weekly, not bi-weekly
kitshef
+5
Level 86
May 8, 2014
Really should not accept bicep. The singular is biceps.
Sifhraven
+1
Level 73
Apr 9, 2019
Agreed
EcceHomo
+2
Level 84
Jan 27, 2023
yep
YogBarOg
+2
Level 73
Mar 4, 2023
The S is necessary for binoculars but not for biceps? Go figure.
LarryLovage
+7
Level 55
Dec 20, 2014
I would say "supported by both Republicans and Democrats" is the least common usage of that word, and mention of Reps and Dems makes it too USA-specific.

The word can mean "comprising both political parties" when referring to committees, or even "independent of any one political party".

JackBeNimble
+10
Level 82
Nov 14, 2020
Agreed. "Supported by two/both parties" is a far more accurate definition, plus it makes it geographically-neutral. The word is used all over the world, and is in no way tied to the US political system.
Ferbin
+2
Level 78
Aug 13, 2021
Agreed.
redsplat
+1
Level 73
Feb 16, 2023
Hear hear. I missed this one because of the overly narrow specification, though I'm familiar with bipartisanship. Let all our parties work together to encourage a tweak to the clue :)
wolfcat95
+2
Level 66
Mar 11, 2023
I agree, but... As a point of order, "independent of any one political party," is NON-partisan, not bipartisan. I know that is slightly pedantic, but in a few instances it can really make a difference.
akwildrose
+20
Level 51
Apr 24, 2015
"One attracted to either men or women" technically means someone who is only attracted to one sex or the other. I think you mean "One attracted to both men and women."
redsplat
+1
Level 73
Feb 16, 2023
I agree. It's probably best to phrase it more specifically as, "one who can be attracted to men or women," or "one who can be attracted to both men and women."
InterAlia
+4
Level 79
Mar 4, 2023
Your second version is fine. Your first has the same problem as the actual hint.
InterAlia
+3
Level 79
Mar 4, 2023
Right. It's not either/or. It's both/and.
celebeth
+3
Level 71
Aug 19, 2015
Is anything bipartisan in the US anymore?
Maladroit
+2
Level 51
Nov 29, 2017
Net neutrality.
IsleAuHaulte
+1
Level 91
Feb 8, 2023
Love of turning everything into a conspiracy theory.
3NRD
+2
Level 40
Mar 4, 2023
everything is a conspiracy
AlexThirkell
+1
Level 74
Mar 4, 2023
Including that?
brandybuck96
+3
Level 83
Nov 30, 2015
I only got bivalve because of a long discourse in a Jules Verne book about mussels. Learnt a lot of entirely pointless terms in both French and English from that one.
FanofTom
+2
Level 21
Dec 5, 2015
Can BIrd be a possible answer for 2-Footed animal ?
Carry
+1
Level 63
Aug 10, 2016
That's what I first guessed but birds have claws as "feet".
Hamburgler
+1
Level 47
Feb 21, 2018
After a quick google search of 'do birds have feet' I found that almost all of the sources refer to the things on the end of birds' 'legs' as feet. It also referred to the appendages as toes.
InterAlia
+3
Level 79
Mar 4, 2023
Bi- is not a prefix in bird.
DonTheLamplighter
+3
Level 86
Oct 13, 2017
Bisect. The root of why everybody mispronounces the word dissect. And now through ubiquitous conflation, DYE-sect has now become an acceptable pronunciation. SMH.
stubart409
+1
Level 68
Oct 20, 2017
Would you believe I missed 'bicentennial'? And I spelled 'bipartisan' with a 'z'. A 'z' goddamnit!
Olober
+13
Level 57
Oct 20, 2017
Bisexual means to be attracted to 2 genders. Those genders don't necessarily have to be men and women, and the wording of the clue implies that a bisexual person is attracted to either men or women, when they would actually be attracted to both at the same time
TomatosRaafatos
+17
Level 75
Aug 7, 2018
There are only 2 genders.
TomatosRaafatos
+11
Level 75
Aug 7, 2018
*grabs popcorn*
InterAlia
+4
Level 79
Mar 4, 2023
Put it down. The instigator doesn't get the popcorn.
introvertigo
+10
Level 43
Sep 20, 2018
Wrong
DukeOfLorraine
+6
Level 65
Mar 4, 2023
You either have a Y chromosome (male) or you don't (female), which accounts for abnormal genetic combinations (not XX or XY). So yeah, it's as binary as it can get
RobNobody
+2
Level 79
Mar 4, 2023
Any geneticist will tell you it's actually a lot more complicated than that.
jmia5211
+6
Level 48
Nov 3, 2021
incorrect
Charliezard
+2
Level 66
Feb 1, 2023
Well, there are definitely only two sexes.
redsplat
+4
Level 73
Feb 16, 2023
@Charliezard Tell that to intersex folks.
Shade9099
+1
Level 68
Feb 21, 2018
Bigfoot for 2-legged animal?
DonTheLamplighter
+2
Level 86
Feb 3, 2023
After carefully researching this topic, I found that the name actually refers to Sasquatch's having 2 gfoots, not legs.
HenryFails4
+1
Level 35
May 22, 2018
Could you specify in the italics if it's just the prefix bi- or words that start with bi that don't mean two?
DukeOfLorraine
+1
Level 65
Mar 4, 2023
All do in the list.
kalbahamut
+2
Level 81
Jul 10, 2018
I can't believe nobody pointed this out yet, but bipolar and manic depressive are not the same thing. I had this on one of my April Fools quizzes.
Remster
+6
Level 79
Jan 25, 2023
Bipolar disorder and manic depression are indeed the same thing. (I've just looked up your quiz. Your trick question leaves out the depression bit.)
pkerr116
+4
Level 72
Jan 26, 2023
Yes. The two describe the same condition. There are many sub-variations but only one condition.
CardinalSin
+3
Level 80
Jul 10, 2018
I got them all except for the tooth. I must say, on this side of the Atlantic (E. side), I've never heard them called that - they are premolars. Indeed, it is normal for some of them to have more than two cusps.
kitsims
+4
Level 84
Jan 26, 2023
I only got it because of Little Shop of Horrors

“I thrill when I drill a bicuspid

It’s swell, though they tell me I’m mal-ad-juh-usted…”

redsplat
+2
Level 73
Feb 16, 2023
Ahhaha! Thank you for evoking this bit of Steve Martin performance genius :)
TomatosRaafatos
+3
Level 75
Aug 7, 2018
Accept Bigamous for Bigamist?
Ferbin
+2
Level 78
Aug 13, 2021
Yeah, I was confused as to why it didn't accept "bigamous". It should.
Algernon
+2
Level 73
Feb 1, 2023
And or Bigamy.
Keithg
+1
Level 49
Feb 13, 2019
6% didn't know bisexual? I thought it might have been 50/50
Sifhraven
+6
Level 73
Apr 9, 2019
Is there a joke somewhere in there?
Sifhraven
+18
Level 73
Apr 9, 2019
Bisexual means exactly the opposite of being either attracted to men, or to women. It means to be attracted to both. If you are attracted to either men, or women, you are heterosexual or homosexual depending on your own sex. Quite a big mess/mix up imho. (Like saying that a guy that likes women is homosexual)
loganite
+7
Level 91
Mar 31, 2020
I thought the same thing. The clue should read "attracted to both men and women."
TurkeyCookTime
+3
Level 83
Feb 28, 2020
I have never heard the term "Bicuspid" I have learned and always heard them called "canines"
AbiA
+2
Level 86
May 8, 2022
The bicuspids are, more specifically, between the canines and the molars and are usually referred to as premolars.
SpartanLlama
+1
Level 74
May 10, 2020
How tf did I forget bicicle
JoshPen
+4
Level 78
Jan 25, 2023
because it is spelled bicycle?
Beatlesqueen432
+2
Level 44
Dec 21, 2020
Missed bigamist because I kept thinking bigamy 🤦
JoshPen
+1
Level 78
Jan 25, 2023
You should have consulted with your sister-wives before answering. :)
Clark1
+1
Level 26
Mar 4, 2023
Same. I typed in 'Bigamy' 'Bilygamy' 'Bigamous' 'Polygamy' and 'Polygamous' before I ran out of time.
81928128
+2
Level 61
Jan 25, 2023
maybe accept bigamous?
Quizmaster
+2
Level ∞
Jan 25, 2023
That will work now.
BlackLab
+4
Level 66
Jan 25, 2023
Bigamy should work, because that is what I typed :D
JoshPen
+7
Level 78
Jan 25, 2023
could "to cut in two" also be 'bifurcate'?
plattitude
+1
Level 95
Jan 25, 2023
Perhaps. In my mind bifurcation typically implies a separation and also a copying, so you end up with 2 wholes instead of 2 halves. That may be entirely connotation though, and not in the denotation of the term.
AbiA
+1
Level 86
Jan 25, 2023
To bifurcate is to fork or split into two branches which are still attached. Like a snake’s tongue.
Zupity
+4
Level 67
Jan 25, 2023
The bigamist clue really threw me because it is not a correct definition. A bigamist is someone who illegally has more than one spouse concurrently. The spouses don't have to be wives, and there can be more than two. Legality is an essential part of the definition, because in some times and places multiple marriage has not been classed as bigamy.
Remster
+4
Level 79
Jan 26, 2023
Did you manage to guess the right answer, despite the colossal red herrings?
TomatosRaafatos
+3
Level 75
Jan 26, 2023
I think bicuspids are the ones between molars and canines, not incisors.
Ninor
+1
Level 57
Mar 4, 2023
Couldn't the trade agreement also be "binding"
DukeOfLorraine
+2
Level 65
Mar 4, 2023
It comes from bind-ing, not bi-nding or bi-inding. Not the root for 2.
RuthlessCosmo
+1
Level 75
Mar 4, 2023
And if you are Lorelei Lee (played by Marilyn Monroe in "Gentlemen Prefer Blondes"), does singing "Diamonds Are A Girl's Best Friend" make you blingual?
summer19
+2
Level 40
Mar 4, 2023
Aw can you accept "bigamy" for "bigamist"
Clark1
+1
Level 26
Mar 4, 2023
Please do.
YogBarOg
+3
Level 73
Mar 4, 2023
Is there a lack of consistency if you accept bicep for biceps and bifocal for bifocals but not binocular for binoculars?
Neodymium
+1
Level 63
Mar 6, 2023
You don't accept pant for pants or scissor for scissors.
RobNobody
+3
Level 79
Jul 20, 2023
Then why accept "bicep" for "biceps" and "bifocal" for "bifocals"?
buck1017
+1
Level 78
Jan 31, 2024
because there is no such word as binocular. I mean there is, but it's an adjective and not the noun form that the clue is asking for. Same for bifocals. If it accepts bifocal, that seems like an error to me.
buck1017
+2
Level 78
Jan 31, 2024
Please accept bifurcate in addition to bisect. Both mean to divide in two.
undeadwarrior
+1
Level 65
Feb 17, 2025
Stop dropping the 's'! I'm sick of typing it in, then having it left over!
Sifhraven
+1
Level 73
Apr 14, 2025
Hmm it actually is news to me bipolar and manic depression is the same thing! I had no idea and am very surprised. Weird how I wasn't aware of this. I had quite a good idea of what manic depression was and admittedly my knowledge of what bipolar was, was lacking. But I never associated the two!

The only thing I remember reading about it was something about having difficulties to form (long-lasting) relationships/friendships so what it was beyond that had always remained a bit of a mystery to me.

Ah after some more googling, I somehow equated/mixed it up with borderline... both starting with a b..

That being said, I still didn't know bipolar=manic depression. I guess part of the reason is that in Dutch the second term is usually used in everyday live and bipolar disorder mainly in official situations (literature/people working in the mental health sector)

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