defective conversion of cartilage into bone, especially at the epiphyses of long bones, producing a type of dwarfism.
a skeletal disorder, characterized by failure of normal conversion of cartilage into bone, that begins during fetal life and results in dwarfism

achondroplasia a·chon·dro·pla·sia (ā-kŏn’drō-plā’zhə, -zhē-ə, ə-kŏn’-) or a·chon·dro·plas·ty (ā-kŏn’drō-plās’tē, ə-kŏn’-)
improper development of cartilage at the ends of the long bones, resulting in a form of congenital dwarfism. also called osteosclerosis congenita.
a·chon’dro·plas’tic (-plās’tĭk) adj.

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