Scottish National Dictionary (1700–)
About this entry:
First published 1971 (SND Vol. VIII).
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.
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"Sleek n.4". Dictionary of the Scots Language. 2004. Scottish Language Dictionaries Ltd. Accessed 27 Jun 2022 <http://www.dsl.ac.uk/entry/snd/sleek_n4>