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.
BLUE-SICKNESS, n. “A kind of rot in sheep” (Sc. 1784–1815 Annals of Agric. (E.D.D.)). Cf. blue-spald s.v. Blue, III. 6.