syndactyly
/sɪnˈdæktɪlɪ/noun
mass noun
- Medicine & Zoology the condition of having some or all of the fingers or toes wholly or partly united, either naturally (as in web-footed animals) or as a malformation【医, 动】并指（现象）, 并趾（现象）。
词源
mid 19th cent.: from SYN- 'united' + Greek daktulos 'finger' + -Y3 .