Scottish National Dictionary (1700–)
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First published 1965 (SND Vol. VI).
This entry has not been updated since then but may contain minor corrections and revisions.
NUN, n. The herring, Clupea harengus (Ags., Bwk. c.1935 Fishery Board Gl.). The name is given in Eng. to various birds from fancied resemblances to the habit of a nun.