ectrodactyly

noun

ec·​tro·​dac·​ty·​ly -ˈdak-tə-lē 

plural ectrodactylies

: congenital complete or partial absence of one or more fingers or toes and especially the middle digits that is inherited as an autosomal dominant or recessive trait or an X-linked recessive trait or that may occur as a spontaneous mutation

ectrodactylous

-tə-ləs 

adjective