/ Dictionary / Index I icosahedron: Meaning and Definition of Find definitions for: i•co•sa•he•dron Pronunciation: (ī-kō"su-hē'drun, ī-kos"u-), [key] — pl. -drons, -dra a solid figure having 20 faces. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: icosahedron (Thesaurus) iconostasis icositetrahedron Related Content Daily Word Quiz: profiterole Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language