Scottish National Dictionary (1700–)
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First published 1965 (SND Vol. VI).
This entry has not been updated since then but may contain minor corrections and revisions.
LOG SKY, n. comb. A fine night with big clouds hiding the moon (Mry. 1919 T.S.D.C.).
[? from log- as in Logg-water, or from Log, n.1, 3.]