GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Coom (?), 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.
   
   [1913 Webster]