One of the mysteries of the English language finally explained.
Excessive growth, accompanied by thickening and curvature, of one or more nails (usually toenails).
Mid 19th century; earliest use found in Robley Dunglison (1798–1869), physician and medical writer. From onycho- + post-classical Latin gryphosis curvature of the nails from Byzantine Greek γρύπωσις hooking of the nails from ancient Greek γρυπῶσθαι to become hooked + -ωσις.
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