/ Dictionary / Index P pentaploid: Meaning and Definition of Find definitions for: pen•ta•ploid Pronunciation: (pen'tu-ploid"), [key] — adj. having a chromosome number that is five times the haploid number. —n. a pentaploid cell or organism. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. pentangular pentapody Related Content Daily Word Quiz: simian Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language