/ Dictionary / Index A alexin: Meaning and Definition of Find definitions for: a•lex•in Pronunciation: (u-lek'sin) [key] — n. Immunol. complement (def. 10). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Alexicacus alexipharmic Related Content Daily Word Quiz: procrastinate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language