Scottish National Dictionary (1700–)
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First published 1941 (SND Vol. II).
This entry has not been updated since then but may contain minor corrections and revisions.
CAIN-AN'-ABEL, n.phr. "The tubers of the orchis, O. mascula or O. latifolia, of which 'Cain' is the heavier" (ne., w.Rxb. 1923 Watson W.-B.).