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1. Oxford Dictionary

   ulna

   • IPA[ˈʌlnə]

   英式

   • n.
     the thinner and longer of the two bones in the human forearm, on the side opposite to the thumb.；the bone in a quadruped's foreleg or a bird's wing that corresponds to the ulna in a human being.

   • noun: ulna, plural noun: ulnae

2. • 更多解釋

   ulna

   • IPA[ˈəlnə]

   美式

   • n.
     the thinner and longer of the two bones in the human forearm, on the side opposite to the thumb.

   Oxford American Dictionary