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.
GRIMSTER, n. Also grinster. An unusually low tide: “a grimster o' a ebb” (Sh. 1908 Jak. (1928) s. v. grefster); also attrib.: “a grimster ebb” (Sh. 1914 Angus Gl.); “ebb during spring tides” (Sh. 1899 J. Spence Folk-Lore 120, grinster).
Hence applied to anything very large: “a great grimster” (Angus Gl.). [′grɪmstər]
[Prob. nasalised forms of Grefster, q.v.]
