/ Dictionary / Index S spermotoxin: Meaning and Definition of Find definitions for: sper•mo•tox•in Pronunciation: (spûr"mu-tok'sin), [key] — n. a substance toxic to spermatozoa. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. spermotoxic spermous Related Content Daily Word Quiz: tactful Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language