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