Achondroplasia

n. dwarfism, growth impairment (Medicine)

Achondroplasia is a type of autosomal dominant genetic disorder that is a common cause of  dwarfism. Achondroplastic dwarfs have short stature, with an average adult height of 131 cm (4 feet 3.8 inches) for males and 123 cm (4 feet 0.6 inches) for females.
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Achondroplasia is the most common cause of dwarfism, or significantly abnormal short stature. [more]Achondroplasia - Community and Resources

Noun
1. an inherited skeletal disorder beginning before birth; cartilage is converted to bone resulting in dwarfism
(synonym) achondroplasty, osteosclerosis congenita, chondrodystrophy
(hypernym) genetic disease, genetic disorder, genetic abnormality, genetic defect, congenital disease, inherited disease, inherited disorder, hereditary disease, hereditary condition

A genetic disorder of bone growth, the most common cause of short stature with disproportionately short arms and legs.