Webster’s Revised Unabridged Dictionary · 1913
Coom
Coom (ko͞om), n. [Cf. G. kahm mold gathered on liquids, D. kam, Sw. kimrök pine soot, smoke black, Icel. kām grime, film of dirt.] Soot; coal dust; refuse matter, as the dirty grease which comes from axle boxes, or the refuse at the mouth of an oven. Phillips. Bailey.