/ Dictionary / Index A autacoid: Meaning and Definition of Find definitions for: au•ta•coid Pronunciation: (ô'tu-koid"), [key] — n. Physiol. any physiologically active internal secretion, esp. one of uncertain classification, as histamine or prostaglandin. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: autacoid (Thesaurus) aut- autarch Related Content Daily Word Quiz: penchant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language