English Etymology From a- + dactyly or a- + dactyl- + -y. Noun adactyly (uncountable) (biology, medicine) Congenital absence of the digits (the fingers or toes). Synonyms adactylism Coordinate terms syndactyly (syndactylism) Translations absence of fingers or toes Finnish: adaktylia French: adactylie (fr) f Italian: adattilia f Portuguese: adactilia f Slovak: adaktýlia (sk) f Remove adsWikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads