Английский разговорный словарь (основной) - involute

ˈɪnvəlu:t 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). [L involutus past part. of involvere: see INVOLVE]