Enlargement with increased thickening and curvature of the fingernails or toenails. [onycho- + G. gryposis, a curvature]
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on·y·cho·gry·po·sis -gri-'pō-səs n, pl -po·ses -.sēz an abnormal condition of the nails characterized by marked hypertrophy and increased curvature
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on·y·cho·gry·po·sis (on″ĭ-ko-grə-poґsis) onychogryphosis.Medical dictionary. 2011.