culm
noun
Origin
From Middle English culme, colme (“fragments of coal”), of uncertain origin. Probably from Old English *colm, related to Old English col (“coal”). Alternatively, perhaps from Welsh cwlm (“knot or tie”), applied to this species of coal, which is much found in balls or knots in some parts of Wales.
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Broader terms
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.