1 formal Involved or intricate.
complex, complicated, convoluted, tangled, entangled, ravelled, twisted, knotty, maze-like, labyrinthine, winding, serpentine, circuitous, sinuous
- ‘the art novel has grown increasingly involute’
2 technical Curled spirally.
- 2.1Zoology (of a shell) having the whorls wound closely round the axis.‘Most contemporary goniatitids had an involute shell with compressed whorls.’
- ‘In the Anaspidea there is a tendency for parapodia to enlarge and, together with the mantle, to enclose the fragile shell (with increasingly reduced and involute spire).’
- ‘Although no equatorial sections were recovered, the present specimens exhibit a likely involute initial stage followed by biserial, uncoiled later stage in which chambers are more flattened.’
- ‘The fundamental structure of the proloculus is the innermost part of the spirally arranged shell; it resembles the involute type of planispirally arranged foraminifera tests.’
- ‘They evolved in the Devonian, comprising evolute to involute planispirally coiled conchs quite similar to that of the contemporaneous nautiloids.’
- 2.2Botany (of a leaf or the cap of a fungus) rolled inwards at the edges.‘They were found to comprise at least three different traits: involute leaves, early flowering, and Apetala flowers.’
- ‘Distinguishing characteristics are fully double, involute florets that are narrow and pointed.’
- ‘This mutant displayed involute leaves and early flowering, although less than clf and icu2 mutants (20 days after sowing).’
- 2.1Zoology (of a shell) having the whorls wound closely round the axis.
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‘Since normals to a straight line never intersect and tangents coincide with the curve, evolutes, involutes and pedal curves are not too interesting.’
- ‘He defines evolutes and involutes of curves and, after giving some elementary properties, finds the evolutes of the cycloid and of the parabola.’
- ‘Hence a curve has a unique evolute but infinitely many involutes.’
- ‘The evolute and the involute of an equiangular spiral is an identical equiangular spiral.’
- ‘Both the evolute and involute of a cycloid is an identical cycloid.’
Mid 17th century from Latin involutus, past participle of involvere (see involve).