chord of an arch
Webster's Dictionary (GCIDE)
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]