/ Dictionary / Index P polyoestrous: Meaning and Definition of Find definitions for: pol•y•oes•trous Pronunciation: (pol"ē-es'trus, -ē'strus), [key] — adj. polyestrous. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: polyoestrous (Thesaurus) polynya polyol Related Content Daily Word Quiz: hale Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language