/ Dictionary / Index P ploidy: Meaning and Definition of Find definitions for: ploi•dy Pronunciation: (ploi'dē), [key] — n. Biol. the number of homologous chromosome sets present in a cell or organism. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. -ploid plomb Related Content Daily Word Quiz: tactful Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language