/ Dictionary / Index C catsup: Meaning and Definition of Find definitions for: cat•sup Pronunciation: (kat'sup, kech'up, kach'-), [key] — n. ketchup. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: catsup (Thesaurus) cat suit cat's whisker Related Content Daily Word Quiz: mongrel Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language