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The Collaborative International Dictionary of English v.0.48:

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]
The Collaborative International Dictionary of English v.0.48:

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]