Scottish National Dictionary (1700–)
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First published 1952 (SND Vol. III).
This entry has not been updated since then but may contain minor corrections and revisions.
CULBERT, n. “The eider duck, Somateria mollissima” (Bwk. 1895 G. Muirhead Birds of Bwksh. II. 123).
[The eider duck was known in Nhb. as (St) Cuthbert's duck (cf. Cuddoo). Fif.1 1935 gives Culbert as a form of the proper name Cuthbert.]