—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
Useful english dictionary. 2012.