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.
SLOUM, n. The green scum or slime that floats on the surface of stagnant water (Rxb. 1825 Jam., 1923 Watson W.-B.). [slʌum]
[Orig. obscure. Poss. connected with sloomy, Sloom, v.1, 3.]
