Scottish National Dictionary (1700–)
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First published 1968 (SND Vol. VII).
This entry has not been updated since then but may contain minor corrections and revisions.
ROTTACH, n. A circular dirty mark, esp. one round the mouth or round the hem of a garment (Arg. 1936 L. McInnes S. Kintyre 12). Gael. [′rɔtəx]
[Gael. rotach, the circle of mud gathered by a female's dress on a muddy road.]