brachium
  腕; 臂
  bra·chi·um /ˈbrekɪəm/ 名詞
  肱,(上)臂,肘脈,前脛節
  Brach·i·um n.; pl. Bracchia   Anat. The upper arm; the segment of the fore limb between the shoulder and the elbow.
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  brachium
       n : (biology) a branching or armlike part of an animal
       [also: brachia (pl)]