Scottish National Dictionary (1700–)
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First published 1952 (SND Vol. III).
This entry has not been updated since then but may contain minor corrections and revisions.
DUNDY, n. Mining: coal burned in the seam by an intrusion of molten rock (Sc. 1886 J. Barrowman Mining Terms 26, Ayr. 1950).
[? Cf. Eng. dial. dundy, dun-grey.]