Originally posted by Parallax Inflammable meaning "capable of being set alight"? No.
According to Merriam-Webster, "inflammable" is the older word and is derived directly from the Latin "inflammare", a verb meaning "to cause to catch fire". A few hundred years later, in the early 1800's, someone figured out that derivation from "flammare" (also a verb, "to catch fire") was more correct, hence the birth of "flammable" in English. The dictionary folk say they are synonyms. I tend to use "flammable".
Your reference to the medical "inflammation" is an interesting extension that I will have to ponder. I have never seen "inflammable" used in a medical sense (prone or capable of inflammation).
Steve