/ Dictionary / Index C colossal: Meaning and Definition of Find definitions for: co•los•sal Pronunciation: (ku-los'ul), [key] — adj. extraordinarily great in size, extent, or degree; gigantic; huge. of or resembling a colossus. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: colossal (Thesaurus) Colossae Colosseum Related Content Daily Word Quiz: lunar Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language