Scottish National Dictionary (1700–)
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First published 1960 (SND Vol. V).
This entry has not been updated since then but may contain minor corrections and revisions.
¶HEIDIN, n. “A haze to the lee, a sign of bad weather” (Mry.1 1925).
[Appar. vbl.n. from Heid. ? Cf. Eng. dial. weatherhead, a secondary rainbow.]