os·te·o·ma /ˌɑstiˈomə/
  骨瘤
  os·te·o·ma /ˌɑstɪˈomə/ 名詞
  骨瘤
  Os·te·o·ma n.; pl. Osteomata   Med. A tumor composed mainly of bone; a tumor of a bone.
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  osteoma
       n : a slow growing benign tumor of consisting of bone tissue;
           usually on the skull or mandible
       [also: osteomata (pl)]