The congenital absence of all or part of one or more fingers or toes. The term ectrodactyly has been applied to a variety of malformations of the fingers or toes. It is probably best reserved for: transverse terminal aphalangia (absence of the last bone in the finger or toe), adactylia (total absence of a finger or toes), or acheiria (total absence [..]

(n) congenital abnormality involving the absence of some fingers or toes