Scottish National Dictionary (1700–)
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First published 1976 (SND Vol. X).
This entry has not been updated since then but may contain minor corrections and revisions.
BLACK-A-MOOR, n. Sc. usage: see quot.Bwk. 1809 R. Kerr Agric. Bwk. 291:
A round purple coated, or excessively dark blue skinned potatoe, provincially named black-a-moors, or black potatoes.