Adactylism is defined as the congenital absence or malformation of fingers or toes. Synonyms for this condition might include polydactyly, oligodactyly, syndactyly, or brachydactyly. Polydactyly refers to the presence of extra fingers or toes, while oligodactyly involves the absence of fingers or toes. Syndactyly involves the fusion of fingers or toes, and brachydactyly involves the shortening of the bones in the fingers or toes. Other related conditions may include ectrodactyly, which involves a split hand or foot, or amniotic band syndrome, which can result in constriction or loss of fingers or toes before birth.