Scottish National Dictionary (1700–)
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First published 1971 (SND Vol. VIII).
This entry has not been updated since then but may contain minor corrections and revisions.
SLEEK, n.4 An altered form of sleet, also found in Eng. dial. (Fif. 1825 Jam.). Hence sleekie, -y, adj.Fif. 1825 Jam.:
A sleeky day, a day in which there falls a considerable quantity of rain mixed with snow.