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orthodontian.

英 ,ɔːθəʊ'dɒntɪə
中文n. 正牙学;畸齿校整术(等于orthodontics)
词根词源
orthodontia (n.)1849, from ortho- + Greek odon (genitive odontos) "tooth" (see tooth) + abstract noun ending -ia.
关键词
orthodontia