Culm, n. [Perh. from W. cwlm knot or tie, applied to this species of coal, which is much found in balls or knots in some parts of Wales: cf. OE. culme smoke, soot.] (Min.) (a) Mineral coal that is not bituminous; anthracite, especially when found in small masses. (b) The waste of the Pennsylvania anthracite mines, consisting of fine coal, dust, etc., and used as fuel. Raymond.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.