Scottish National Dictionary (1700–)
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First published 1965 (SND Vol. VI).
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.
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"Nagnail n.". Dictionary of the Scots Language. 2004. Scottish Language Dictionaries Ltd. Accessed 26 Sep 2022 <http://www.dsl.ac.uk/entry/snd/nagnail>