/ Dictionary / Index E estrous: Meaning and Definition of Find definitions for: es•trous Pronunciation: (es'trus), [key] — adj. pertaining to or involving the estrus. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: estrous (Thesaurus) estrone estrous cycle 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