The Collaborative International Dictionary of English v.0.48:

Chord \Chord\ (k[^o]rd), n. [L chorda a gut, a string made of a
   gut, Gr. chordh`. In the sense of a string or small rope, in
   general, it is written cord. See Cord.]
   1. The string of a musical instrument. --Milton.
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   2. (Mus.) A combination of tones simultaneously performed,
      producing more or less perfect harmony, as, the common
      chord.
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   3. (Geom.) A right line uniting the extremities of the arc of
      a circle or curve.
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   4. (Anat.) A cord. See Cord, n., 4.
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   5. (Engin.) The upper or lower part of a truss, usually
      horizontal, resisting compression or tension. --Waddell.
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   Accidental, Common, & Vocal chords. See under
      Accidental, Common, and Vocal.

   Chord of an arch. See Illust. of Arch.

   Chord of curvature, a chord drawn from any point of a
      curve, in the circle of curvature for that point.

   Scale of chords. See Scale.
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