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.
CUD-DOO, n. comb. “Eider duck, Somateria mollissima” (Bwk. 1895 G. Muirhead Birds of Bwksh. II. 123).
[Evidently an abbr. form of Nhb. dial. (St) Cuthbert's duck, the eider-duck. For Cud = Cuthbert, cf. Cuddy, n.1: doo may be due to confusion with Doo, a dove.]