/ Dictionary / Index D dodecagon: Meaning and Definition of Find definitions for: do•dec•a•gon Pronunciation: (dō-dek'u-gon", -gun), [key] — n. Geom. a polygon having 12 angles and 12 sides. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: dodecagon (Thesaurus) dodeca- dodecahedron Related Content Daily Word Quiz: diligent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language