/ Dictionary / Index A amnio: Meaning and Definition of Find definitions for: am•ni•o Pronunciation: (am'nē-ō"), [key] — pl. -ni•os. amniocentesis. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: amnio (Thesaurus) Amnesty International amniocentesis Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language