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.
‡GRUMMA, n. Also groma. “Light mist, esp. mist with rifts through which the blue sky is seen” (Sh. 1908 Jak. (1928), groma), “a sort of mirage caused by copious exhalation from the ground” (Sh. 1914 Angus Gl., ‡Sh. 1955).
[? Deriv. of Grum, n.1, q.v. Cf. Sw. grumla, obscure, hazy, and Sh. grumset, muddy, turbid, streaky.]
