/ Dictionary / Index D decahedron: Meaning and Definition of Find definitions for: dec•a•he•dron Pronunciation: (dek"u-hē'drun), [key] — pl. -drons, -dra a solid figure having ten faces. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: decahedron (Thesaurus) decagram decahydrate Related Content Daily Word Quiz: arid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language