Scottish National Dictionary (1700–)
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First published 1956 (SND Vol. IV).
This entry has not been updated since then but may contain minor corrections and revisions.
†GLASHTROCH, adj. “A term expressive of continued rain, and the concomitant dirtiness of the roads” (Ayr. 1825 Jam.).
[Prob. a variant of Clash, n.1, 2., a mass of any soft or moist substance; a downpour of rain, + intensive suff. -t(e)r, + adj. -och.]