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Pronunciation: koy'lo-nik'e-a

Definition: A malformation of the nails in which the outer surface is concave; often associated with iron deficiency or softening by occupational contact with oils.

Synonym(s): spoon nail

[G. koilos, hollow, + onyx (onych-), nail]

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© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.