The congenital absence of all or part of one or more fingers or toes.

This term is used for a range of conditions from aphalangia (in which some of the phalanges or finger bones are missing), to adactyly, adactylia (the absence of a digit or toe), transverse terminal aphalangia (absence of the last bone in the finger or toe), and acheiria (total absence of one or both hands).