| A | B |
| antagonist | one who is against, or contends with, another in a struggle, fight, or contest; opponent; adversary; foe |
| antibiotic | substance obtained from tiny living organisms that works against harmful bacteria |
| antibody | substance manufactured in the body that works against germs or poisons produced by germs |
| antidote | remedy that acts against the effects of a poison / countermeasure |
| antihistamine | drug used against certain allergies and cold symptoms |
| antipathy | feeling against; distate; repugnance; dislike; enmity |
| antiseptic | literally, "against decaying"; substance that prevents infection by checking the growth of microorganisms; germicide |
| antitoxin | substance formed in the body as the result fo the introduction of a toxin (poison) and capable of acting against that toxin |
| antonym | word meaning the opposite of another word; opposite |
| dermatologist | physician who specializes in the science that deals with the skin and its diseases |
| dermis | inner layer of the skin |
| epidermis | outer layer of the skin |
| hypodermic | beneath the skin |
| taxidermist | one who practices the art of preparing, stuffing, and mounting the skins of animals in lifelike form |
| acronym | name formed from the first letter or letters of other words |
| anonymous | nameless; unnamed; unidentified |
| homonym | word that sounds like another but differs in meaning |
| onomatopoeia | use of words whose sound suggests their meaning |
| pseudonym | literally, "false name"; fictitious name used by an author; pen name; alias |
| synonym | word having the same meaning as another word |