dertrum / ˈdɜr trəm /

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dertrum 的定义

n. 名词 noun

plural der·tra [dur-truh]. /ˈdɜr trə/. Ornithology.

  1. the extremity of the maxilla of a bird's bill, especially when hooked or differentiated from the rest of the bill, as in pigeons and plovers.