/ Dictionary / Index A allantoic: Meaning and Definition of Find definitions for: al•lan•to•ic Pronunciation: (al"un-tō'ik), [key] — adj. of or pertaining to the allantois. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: allantoic (Thesaurus) all'antica* allantoid Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language