/ Dictionary / Index A amphidiploid: Meaning and Definition of Find definitions for: am•phi•dip•loid Pronunciation: (am"fi-dip'loid), [key] — n. Biol. a plant having the sum of the chromosome numbers of two parental species, owing to the doubling of the chromosomes in a hybrid of two species. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: amphidiploid (Thesaurus) Amphidamas amphidromia Related Content Daily Word Quiz: nefarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language