synonychia

syn·o·nych·i·a

(sin'ō-nik'ē-ă), Fusion of two or more nails of the digits, as in syndactyly. [sin- + G. onyx (onych-), nail]

syn·o·nych·i·a

(sin'ō-nik'ē-ă) Fusion of two or more nails of the fingers or toes, as in syndactyly. [syn- + G. onyx (onych-), nail]