syndactyly
noun
syn·dac·ty·ly
(ˌ)sin-ˈdak-tə-lē
: a union of two or more digits that is normal in some animals (such as various marsupials) and that in humans occurs as an inherited condition or as a part of several genetic disorders and is marked by webbing of two or more fingers or toes and sometimes bony fusion of adjacent digits
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Merriam-Webster unabridged
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