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.
SKIM, n. A thin layer of scum of milk, esp. of Bland in its cask (Sh. 1908 Jak. (1928), Sh. 1970). Deriv. adj. skimmery, of a milk-vessel: having a scum or layer of coagulated milk round the sides, from not being properly washed (Ork. 1929 Marw.).
[Norw. dial. skim, a thin film or layer. Cf. Skim, v., 2., and obsol. Eng. skim, scum.]