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Chord n.

1. The string of a musical instrument.

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.

**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.

Cur·va·ture n.

1. The act of curving, or the state of being bent or curved; a curving or bending, normal or abnormal, as of a line or surface from a rectilinear direction; a bend; a curve.

*The elegant curvature of their fronds.* --*Darwin.*

2. Math. The amount of degree of bending of a mathematical curve, or the tendency at any point to depart from a tangent drawn to the curve at that point.

**Aberrancy of curvature** Geom., the deviation of a curve from a circular form.

**Absolute curvature**. See under Absolute.

**Angle of curvature** Geom., one that expresses the amount of curvature of a curve.

**Chord of curvature**. See under Chord.

**Circle of curvature**. See Osculating circle of a curve, under Circle.

**Curvature of the spine** Med., an abnormal curving of the spine, especially in a lateral direction.

**Radius of curvature**, the radius of the circle of curvature, or osculatory circle, at any point of a curve.

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