noun
osteogenesis imperfecta
Medical term for a group of genetic disorders characterized by fragile bones that break easily.
骨形成不全症は、骨がもろく折れやすい遺伝性疾患です。
Osteogenesis imperfecta is a genetic disorder in which bones are fragile and break easily.
Compound of 骨 (bone) + 形成 (formation) + 不全 (insufficiency) + 症 (disease), literally 'bone formation insufficiency disease'. The exact historical derivation is uncertain; the term is a modern medical coinage.