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.
SMOOL, n.3 The hedge-sparrow, Prunella occidentalis (Dmb. 1970).
[Orig. doubtful. Cf. E.M.E. dykesmowler, id. There may be some connection with Smool, v.1, 1., from its shy, unobtrusive movements.]