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onyxis

[oh-nik-sis]
noun Pathology.
  1. an ingrowing of a fingernail or toenail.
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Origin of onyxis

< Greek onych- (stem of ónyx) nail (see onyx) + -sis
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018