/ Dictionary / Index U uterus: Meaning and Definition of Find definitions for: u•ter•us Pronunciation: (y'tur-us), [key] — pl. u•ter•i u•ter•us•es. the enlarged, muscular, expandable portion of the oviduct in which the fertilized ovum implants and develops or rests during prenatal development; the womb of certain mammals. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: uterus (Thesaurus) utero- Utgard Related Content Daily Word Quiz: cygnet Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language