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evolvent 切展線; 漸開線; 漸屈線; 漸伸線 切展線; 漸開線; 漸屈線; 漸伸線 Involute \In"vo*lute\, n. (Geom.)
A curve traced by the end of a string wound upon another curve, or unwound from it; -- called also {evolvent}. See {Evolute}. [1913 Webster] Evolvent \E*volv"ent\, n. [L. evolvens, -entis, unrolling, p. pr. of evolvere.] (Geom.) The involute of a curve. See {Involute}, and {Evolute}. [1913 Webster]
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