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1. Oxford American Dictionary

   U

   • IPA[yo͞o]

   美式

   • n.
     the twenty-first letter of the alphabet.；denoting the next after T in a set of items, categories, etc.

   • noun: U, plural noun: U's

2. • 釋義

   n.

   名詞

   • 1. the twenty-first letter of the alphabet.
   • ▪ denoting the next after T in a set of items, categories, etc.
   • 2. a shape like that of a capital U, especially a cross section U-shaped glaciated valleys