Scottish National Dictionary (1700–)
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First published 1941 (SND Vol. II).
This entry has not been updated since then but may contain minor corrections and revisions.
†BOULE, n. “A clear opening in the clouds, in a dark rainy day; which is viewed as a prognostic of fair weather” (Ags. 1825 Jam.2). Cf. Bore, n.1, (4).
[Jam. suggests that this is an alternative spelling of Bole, n.1, 3 (2), in an extended meaning.]