Scottish National Dictionary (1700–)
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First published 1976 (SND Vol. X).
This entry has not been updated since then but may contain minor corrections and revisions.
BUTTONER, n. A salmon of the gray scool kind (see Gray, adj., 1. (25)).Slk. 1860 J. Locke Tweed & Don 29:
These buttoner fish are so called from an exterior mark, like a button, on their throat.