chord of an arch

from 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.
      [1913 Webster]

   2. (Mus.) A combination of tones simultaneously performed,
      producing more or less perfect harmony, as, the common
      chord.
      [1913 Webster]

   3. (Geom.) A right line uniting the extremities of the arc of
      a circle or curve.
      [1913 Webster]

   4. (Anat.) A cord. See {Cord}, n., 4.
      [1913 Webster]

   5. (Engin.) The upper or lower part of a truss, usually
      horizontal, resisting compression or tension. --Waddell.
      [1913 Webster]

   {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}.
      [1913 Webster]
    

[email protected]