/ Dictionary / Index A allotrope: Meaning and Definition of Find definitions for: al•lo•trope Pronunciation: (al'u-trōp"), [key] — n. Chem. one of two or more existing forms of an element: Graphite and diamond are allotropes of carbon. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: allotrope (Thesaurus) allotriomorphic allotropic Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language