achondroplasia
noun
achon·dro·pla·sia
ˌā-ˌkän-drə-ˈplā-zh(ē-)ə
: a genetic disorder that is marked by abnormally slow conversion of cartilage to bone during development resulting in a form of dwarfism characterized by a usually normal torso and shortened limbs and that is usually inherited as an autosomal dominant trait
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Merriam-Webster unabridged
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