/ Dictionary / Index S saxitoxin: Meaning and Definition of Find definitions for: sax•i•tox•in Pronunciation: (sak"si-tok'sin), [key] — n. a powerful neurotoxin, CHNO, produced by the dinoflagellate Gonyaulax catenella, the causative agent of red tide. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: saxitoxin (Thesaurus) saxifrage family Saxo Grammaticus 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