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English Dictionary: U by the DICT Development Group
4 results for U
From WordNet (r) 3.0 (2006) [wn]:
  1. (chiefly British) of or appropriate to the upper classes especially in language use
  1. a base containing nitrogen that is found in RNA (but not in DNA) and derived from pyrimidine; pairs with adenine
    Synonym(s): uracil, U
  2. a heavy toxic silvery-white radioactive metallic element; occurs in many isotopes; used for nuclear fuels and nuclear weapons
    Synonym(s): uranium, U, atomic number 92
  3. the 21st letter of the Roman alphabet
    Synonym(s): U, u
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
   Molt \Molt\, Moult \Moult\, v. i. [imp. & p. p. {Molted} or
      {Moulted}; p. pr. & vb. n. {Molting} or {Moulting}.] [OE.
      mouten, L. mutare. See {Mew} to molt, and cf. {Mute}, v. t.]
      [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. --Bacon.

From Webster's Revised Unabridged Dictionary (1913) [web1913]:
   U \U\ ([umac]),
      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, [sect][sect]

From Jargon File (4.2.0, 31 JAN 2000) [jargon]:
   u- pref.   Written shorthand for {micro-}; techspeak when
   applied to metric units, jargon when used otherwise.   Derived from
   the Greek letter "mu",      the first letter of "micro" (and which
   letter looks a lot like the English letter "u").
No guarantee of accuracy or completeness!
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