Scottish National Dictionary (1700–)
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First published 1941 (SND Vol. II).
This entry has not been updated since then but may contain minor corrections and revisions.
†CLACH-COAL, n. comb. Cannel coal (Ayr. 1825 Jam.2), a kind of coal which burns with a strong light.
[E.D.D. derives clach from Gael. clach, a stone; cf. Ger. steinkohle, anthracite, pit-coal (Flügel). A connection, however, with the echoic Clack is suggested by the crackling noise which this coal makes in burning.]
