Involute
Involute , adjective
[Latin involutus, past participle of involvere. See Involve.]
1.
(Botany) Rolled inward from the edges; -- said of leaves in vernation, or of the petals of flowers in astivation. — Gray
2.
(a) (Zoology) Turned inward at the margin, as the exterior lip of the Cyprea.
(b)
(Zoology) Rolled inward spirally.
Also: Involuted
Involute , noun
(Geometry) A curve traced by the end of a string wound upon another curve, or unwound from it; -- called also evolvent. See Evolute.