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.
NAGNAIL, n. Also nangnail. Sc. forms of Eng. agnail, hangnail, a piece of loose skin round the nail, with prosthetic n from wrong division of an (s.Sc. 1887 Jam., Ayr. 1963). Also in Eng. dial.