The Collaborative International Dictionary of English v.0.48:

Music \Mu"sic\, n. [F. musique, fr. L. musica, Gr. ? (sc. ?),
   any art over which the Muses presided, especially music,
   lyric poetry set and sung to music, fr. ? belonging to Muses
   or fine arts, fr. ? Muse.]
   1. The science and the art of tones, or musical sounds, i.
      e., sounds of higher or lower pitch, begotten of uniform
      and synchronous vibrations, as of a string at various
      degrees of tension; the science of harmonical tones which
      treats of the principles of harmony, or the properties,
      dependences, and relations of tones to each other; the art
      of combining tones in a manner to please the ear.
      [1913 Webster]

   Note: Not all sounds are tones. Sounds may be unmusical and
         yet please the ear. Music deals with tones, and with no
         other sounds. See Tone.
         [1913 Webster]

   2.
      (a) Melody; a rhythmical and otherwise agreeable
          succession of tones.
      (b) Harmony; an accordant combination of simultaneous
          tones.
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   3. The written and printed notation of a musical composition;
      the score.
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   4. Love of music; capacity of enjoying music.
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            The man that hath no music in himself
            Nor is not moved with concord of sweet sounds,
            Is fit for treasons, stratagems, and spoils. --Shak.
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   5. (Zool.) A more or less musical sound made by many of the
      lower animals. See Stridulation.
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   Magic music, a game in which a person is guided in finding
      a hidden article, or in doing a specific art required, by
      music which is made more loud or rapid as he approaches
      success, and slower as he recedes. --Tennyson.

   Music box. See Musical box, under Musical.

   Music hall, a place for public musical entertainments.

   Music loft, a gallery for musicians, as in a dancing room
      or a church.

   Music of the spheres, the harmony supposed to be produced
      by the accordant movement of the celestial spheres.

   Music paper, paper ruled with the musical staff, for the
      use of composers and copyists.

   Music pen, a pen for ruling at one time the five lines of
      the musical staff.

   Music shell (Zool.), a handsomely colored marine gastropod
      shell (Voluta musica) found in the East Indies; -- so
      called because the color markings often resemble printed
      music. Sometimes applied to other shells similarly marked.


   To face the music, to meet any disagreeable necessity, such
      as a reprimand for an error or misdeed, without flinching.
      [Colloq. or Slang]
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The Collaborative International Dictionary of English v.0.48:

Musical \Mu"sic*al\, a. [Cf. F. musical.]
   Of or pertaining to music; having the qualities of music; or
   the power of producing music; devoted to music; melodious;
   harmonious; as, musical proportion; a musical voice; musical
   instruments; a musical sentence; musical persons.
   [1913 Webster]

   Musical box, or Music box, a box or case containing
      apparatus moved by clockwork so as to play certain tunes
      automatically. The apparatus may be driven by a wind-up
      spring mechanism or by batteries.

   Musical fish (Zool.), any fish which utters sounds under
      water, as the drumfish, grunt, gizzard shad, etc.

   Musical glasses, glass goblets or bowls so tuned and
      arranged that when struck, or rubbed, they produce musical
      notes. Cf. Harmonica, 1.
      [1913 Webster]

WordNet (r) 3.0 (2006):

music box
    n 1: produces music by means of pins on a revolving cylinder
         that strike the tuned teeth of a comb-like metal plate
         [syn: music box, musical box]