taper

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taper

Engineering (in conical parts) the amount of variation in the diameter per unit of length

taper

[′tā·pər]
(aerospace engineering)
An airfoil feature in which either the thickness or the chord length or both decrease from the root to the tip.
(electricity)
Continuous or gradual change in electrical properties with mechanical position such as rotation or length; for example, continuous change of cross section of a waveguide, or distribution of resistance in a potentiometer.

taper

A gradual diminution of thickness in an elongated object, as in a spire.
References in periodicals archive ?
Dollar in upper 92 yen range, buying on Big-3 bailout tapers off
A possibility of thunderstorms in the valley begins late Wednesday morning and tapers off, with blue skies again by Thursday.
But reducing food intake means your body starts to expend calories at a slower rate so weight loss tapers off.