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.
COSFIT, Cossit, n. The starfish, Asterias vulgaris. Pl. cosfeet (Mry.1 1925), cosfits (Bnff.9 c.1927). The form cossit is given for Crm. in Dial. Avoch and Crm. (1912) 6.Abd. 1932 (per Mry.4):
In their own way these old fishermen appear to divide the family of starfishes roughly into three classes; the light coloured ones (or starfish as a whole) are known by the name of “Cosfeet.”