Designating a monoid (sense B. 1). Obsolete. rare.

Of a surface or curve: not changed in form by inversion (inversion, n. 23).

Pertaining to a ‘scroll’.

Of or relating to a torse: see quot. 1869.

Mathematics and Physics. Of a curve or surface: completely enclosing an area or volume; having no end points.

Mathematics and Mineralogy. Nearly coincident with a given surface or plane.

Mathematics. Of a surface: such that an oriented figure, when moved around any closed path in the surface, returns to its initial position with the…

Of a manifold (manifold, n.1 5): not having a well-defined global coordinate system; not orientable; spec. (of a surface) such that a figure in…