Scottish National Dictionary (1700–)
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First published 1956 (SND Vol. IV).
This entry has not been updated since then but may contain minor corrections and revisions.
FOSSAK, n. Also fossack (Cai. 1902 Annals Sc. Nat. Hist. 20). See quot.Cai. 1887 Harvie-Brown and Buckley Fauna Cai. 289:
The peculiar tidal trout, or so-called “fossak” of the Inver and other rivers.