̷ ̷ˈdaktəˌlizəm noun
( -s )
: the state of being syndactyl : a union of two or more digits that is normal in many birds (as kingfishers, motmots, bee eaters, or hornbills) in which some of the toes are united and in some mammals (as the kangaroos and some other marsupials) and occurs in man as a familial anomaly marked by webbing of two or more fingers or toes