u /ˈju/
 字母u


 Molt, Moult  v. i. [imp. & p. p. Molted or Moulted; p. pr. & vb. n. Molting or Moulting.]  [The prevalent spelling is, perhaps, moult; but as the u has not been inserted in the otherwords of this class, as, bolt, colt, dolt, etc., it is desirable to complete the analogy by the spelling molt.] To shed or cast the hair, feathers, skin, horns, or the like, as an animal or a bird.


 U the twenty-first letter of the English alphabet, is a cursive form of the letter V, with which it was formerly used interchangeably, both letters being then used both as vowels and consonants. U and V are now, however, differentiated, U being used only as a vowel or semivowel, and V only as a consonant. The true primary vowel sound of U, in Anglo-Saxon, was the sound which it still retains in most of the languages of Europe, that of long oo, as in tool, and short oo, as in wood, answering to the French ou in tour. Etymologically U is most closely related to o, y (vowel), w, and v; as in two, duet, dyad, twice; top, tuft; sop, sup; auspice, aviary. See V, also O and Y.
 See Guide to Pronunciation, §§ 130-144.

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 u
      adj : (chiefly British) of or appropriate to the upper classes
            especially in language use
      n 1: a nitrogen-containing base found in RNA (but not in DNA) and
           derived from pyrimidine; pairs with adenine [syn: uracil]
      2: a heavy toxic silvery-white radioactive metallic element;
         occurs in many isotopes; used for nuclear fuels and
         nuclear weapons [syn: uranium, atomic number 92]
      3: the 21st letter of the Roman alphabet