/ Dictionary / Index C coom: Meaning and Definition of Find definitions for: coom Pronunciation: (km), [key] — n. Chiefly Scot. and North Eng. soot; coal dust; smut. dust, esp. sawdust or dust from a gristmill. grease from bearings, axles, etc. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. cooly coomb Related Content Daily Word Quiz: eccentric Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language