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The Collaborative International Dictionary of English v.0.48:Curvature \Cur"va*ture\ (k?r"v?-t?r; 135), n. [L. curvatura. See
Curvate.]
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.
--Cowper.
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The elegant curvature of their fronds. --Darwin.
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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.
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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.

or osculatory circle, at any point of a curve.
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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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