Scottish National Dictionary (1700–)
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First published 1976 (SND Vol. X).
This entry has not been updated since then but may contain minor corrections and revisions.
YERTDRIFT, n. “Drifting snow, snow-shower accompanied by a high wind that causes the snow to drift” (Ork. 1929 Marw.). Cf. erd(d)rift s.v. Erd, 3., and Eart.