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evolute n. 漸屈線
a. 漸屈的 漸屈線漸屈的 Evolute \Ev"o*lute\, n. [L. evolutus unrolled, p. p. of
evolvere. See {Evolve}.] (Geom.) A curve from which another curve, called the involute or evolvent, is described by the end of a thread gradually wound upon the former, or unwound from it. See {Involute}. It is the locus of the centers of all the circles which are osculatory to the given curve or evolvent. [1913 Webster] Note: Any curve may be an evolute, the term being applied to it only in its relation to the involute. [1913 Webster]
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