Scottish National Dictionary (1700–)
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First published 1952 (SND Vol. III).
This entry has not been updated since then but may contain minor corrections and revisions.
CLEFF, adj. “Thin and flattish: ‘A cleff stane'” (Rxb. 1923 Watson W.-B.).
Hence cleffie, “a flat thin stone, such as boys use for skimming across water” (Ib.).
[An aphetic form of Skleff, q.v.]