Syndactyly

Syndactyly
Partial simple syndactyly in the second and third toes
SpecialtyMedical genetics 

Syndactyly is a condition wherein two or more digits are fused together. It occurs normally in some mammals, but is an unusual condition in humans. The term is from Ancient Greek σύν (syn) 'together' and δάκτυλος (daktulos) 'finger'.