palmation
/palˈmeɪʃn/ /pɑːˈmeɪʃn/Chiefly Zoology
noun
Palmate formation or development, especially in an antler; webbed condition in the foot of a bird or animal.
Origin
Mid 19th century; earliest use found in Edward Blyth (1810–1873), zoologist. From palmate + -ion; compare -ation.