Involute

from WordNet (r) 3.0 (2006)

involute
    adj 1: especially of petals or leaves in bud; having margins
           rolled inward [syn: {involute}, {rolled}]
    2: (of some shells) closely coiled so that the axis is obscured

from 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]

from The Collaborative International Dictionary of English v.0.48

Involute \In"vo*lute\, Involuted \In"vo*lu`ted\, a. [L.
   involutus, p. p. of involvere. See {Involve}.]
   1. (Bot.) Rolled inward from the edges; -- said of leaves in
      vernation, or of the petals of flowers in [ae]stivation.
      --Gray.
      [1913 Webster]

   2. (Zool.)
      (a) Turned inward at the margin, as the exterior lip of
          the Cyprea.
      (b) Rolled inward spirally.
          [1913 Webster]

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