[ 'ɪnvəl(j)u:t ]
■ adjective
1》 formal complicated.
2》 technical curled spirally.
↘ Zoology (of a shell) having the whorls wound closely round the axis.
↘ Botany rolled inwards at the edges.
■ noun Geometry the locus of a point considered as the end of a taut string being unwound from a given curve in the plane of that curve. Compare with evolute .
Origin
C17: from L. involutus , past participle of involvere (see involve ).