/ Dictionary / Index P polyploid: Meaning and Definition of Find definitions for: pol•y•ploid Pronunciation: (pol'ē-ploid"), [key] — Biol. Biol. —adj. having a chromosome number that is more than double the basic or haploid number. —n. a polyploid cell or organism. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: polyploid (Thesaurus) polyphyletic polypnea Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language