/ Dictionary / Index O oestrus: Meaning and Definition of Find definitions for: oes•trus Pronunciation: (es'trus, ē'strus), [key] — n. estrus. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: oestrus (Thesaurus) oestrous oeuvre* Related Content Daily Word Quiz: profiterole Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language