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What is "chord of an arch"

The Collaborative International Dictionary
Chord of an arch

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.

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

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

  4. (Anat.) A cord. See Cord, n., 4.

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

    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.