Scottish National Dictionary (1700–)
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First published 1974 (SND Vol. IX).
This entry has not been updated since then but may contain minor corrections and revisions.
SWAB, n.1 A pea or bean pod (Dmf. 1825 Jam.; Rxb. 1923 Watson W.-B.; Dmf., Rxb. 1971), also in comb. pei-swab (Watson).
[Variant of Swap, q.v. Cf. E.M.E. swab, id.]