Scottish National Dictionary (1700–)
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First published 1974 (SND Vol. IX).
This entry has not been updated since then but may contain minor corrections and revisions.
UG, n.2 Also ugg. The pectoral fin and adjacent parts of a fish (Cai. 1905 E.D.D., Cai. 1973). Comb. ugg-bone, the bone behind the gills of a fish (Ork. 1929 Marw., Ork. 1973). [ʌg]
[Norw. ugge, gills, O.N. uggi, a pectoral fin.]