Adactyly is a medical term that refers to the absence or underdevelopment of fingers or toes. Synonyms for adactyly include acrocephalosyndactyly, amelia, brachydactyly, dysmelia, ectrodactyly, and oligodactyly. Each of these terms describes a specific type of limb abnormality. Acrocephalosyndactyly involves the premature closure of the skull's sutures, resulting in abnormalities of the fingers and toes. Amelia refers to the complete absence of one or more limbs. Brachydactyly is characterized by shortened fingers or toes, while ectrodactyly describes a condition where part of a hand or foot is missing. Dysmelia is a general term used to describe any abnormality of the limbs, and oligodactyly refers to the absence of one or more digits.