Medical Definition of achondroplasia
: a genetic disorder that is marked by abnormally slow conversion of cartilage to bone during development and results in a form of dwarfism characterized by a usually normal torso and shortened limbs ◆Achondroplasia is usually inherited as an autosomal dominant trait requiring that only one parent passes on a copy of the defective gene on a chromosome other than a sex chromosome. The majority of cases of achondroplasia result from a new spontaneous gene mutation. —compare ateliosis
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