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.
NAPPA, n. A name for a seal (Ork. 1929 Marw.), phs. a sea-taboo usage.
[Prob. a deriv. of Knap, n.1, a bump, rounded knob, from the appearance of the seal's head.]