Scottish National Dictionary (1700–)
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First published 1968 (SND Vol. VII).
This entry has not been updated since then but may contain minor corrections and revisions.
PICKLE, n.3 The brain (Lth. 1905 E.D.D.). Not otherwise attested. If correct, phs. a jocular extension of Pickle, n.2, 1., sc. the top or head of the body.