It was common practice, based on humorism I believe (the belief that your mood and health was regulated by blood, yellow bile, black bile and phlegm). The idea was that the equilibrium between the 4 was broken. Or something. https://en.wikipedia.org/wiki/Leech#Medicinal_use_of_leeches
If the source of your confusion is "barber" rather than the use of leeches, they were more fully known as "barber surgeons". Normally based with a military, they use their blades for cutting limbs as well as hair, along with other medical practices of the time.
Another request to accept definitions or vocabulary for the lexicon question. Words feels like too vague of an answer, and I never would have gotten it. Every book / website contains words.
Yup! Of course, it depends on the version and canon you're talking about. Luma Lynai only really shows up in a single issue in the early '60s, and Lisa Lasalle is only in the "Earth One" series of graphic novels. There's also Lyla Lerrol, another one-issue love interest from the early '60s.
The other three are generally his "main" love interests: Lana Lang was his childhood sweetheart (originally introduced in the Superboy comics), Lori Lemaris was a mermaid he dated in college (it's complicated), and of course Lois Lane was his primary love interest as an adult.
Clark prefers not to think about how Lex Luthor fits into this.
This is it
Also, I agree with Sulps above but the Wikipedia page lists Byzantium as a name as well (https://en.wikipedia.org/wiki/Byzantine_Empire).
Luma Lynai
Lori Lemaris
Lois Lane
Lisa Lasalle
Lana Lang
Among others (wonder women is one)
The other three are generally his "main" love interests: Lana Lang was his childhood sweetheart (originally introduced in the Superboy comics), Lori Lemaris was a mermaid he dated in college (it's complicated), and of course Lois Lane was his primary love interest as an adult.
Clark prefers not to think about how Lex Luthor fits into this.