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.
- Achondroplastic dwarfism
achondroplastic dwarfism achondroplastic dwarfism n. a congenital dwarfism resulting from a failure of cartilage to normally develop into bone, especially cartilage on the ends of long bones.
achor trouble, a valley near jericho, so called in consequence of the trouble which the sin of achan caused israel (josh. 7:24,26). the expression “valley of achor” probably became proverbial for that which caused trouble, and when isaiah (isa. 65:10) refers to it he uses it in this sense: “the valley of achor, a place […]
achre advisory committee on human radiation experiments
- Achrestic anemia
achrestic anemia achrestic anemia a·chres·tic anemia (ə-krěs’tĭk) n. a macrocytic anemia in which the changes in bone marrow and circulating blood resemble those of pernicious anemia.
the colorless or white variety of tourmaline, often used as a gem. historical examples red tourmaline is, however, sometimes called “rubellite,” and white tourmaline has been called “achroite.” a text-book of precious stones for jewelers and the gem-loving public frank bertram wade