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.
Quotation dates: 1902
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BLACK KEEL, n. Plumbago.s.Sc. 1902 Sir J. A. H. Murray in E.D.D. s.v. keel, n.2:
Ruddle is "reid keel," plumbago is "black keel."