/ Dictionary / Index H haploid: Meaning and Definition of Find definitions for: hap•loid Pronunciation: (hap'loid), [key] — adj. single; simple. pertaining to a single set of chromosomes. —n. an organism or cell having only one complete set of chromosomes, ordinarily half the normal diploid number. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: haploid (Thesaurus) haplography haplology Related Content Daily Word Quiz: pugilist Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language