involute

• POS: Adjective, Noun, Verb (transitive)
• HYPHEN: in=vo=lute

CIDE DICTIONARY

involute, a. [L. involutus, p. p. of involvere. See Involve.].

•  Rolled inward from the edges; -- said of leaves in vernation, or of the petals of flowers in æstivation.  Gray.  [1913 Webster]
•  Turned inward at the margin, as the exterior lip of the Cyprea.  [1913 Webster]

involute, n. 

 A curve traced by the end of a string wound upon another curve, or unwound from it; -- called also evolvent. See Evolute.  [1913 Webster]

OXFORD DICTIONARY

involute, adj. & n.
--adj.
1 involved, intricate.
2 curled spirally.
3 Bot. rolled inwards at the edges.
--n. Geom. the locus of a point fixed on a straight line that rolls without sliding on a curve and is in the plane of that curve (cf. EVOLUTE).

Etymology

L involutus past part. of involvere: see INVOLVE