Geometry. = superficies, n. 1. Obsolete.

Geometry. A continuous extent having only two dimensions (length and breadth, without thickness); an entity such as forms the boundary or one of the…

Mathematics. A continuous extent having only two dimensions (length and breadth, without thickness), whether plane or curved, finite or infinite; an…

= superficies, n. (in various senses).

a geometrical surface which is the locus of all points reached at one instant by an undulatory agitation propagated from any centre.

Mathematics. A developable surface.

Mathematics. An expression, curve, or surface of the fourth degree.

Geometry. A skew ruled surface.

In Solid Geometry: A surface of which every plane section is a conic (see conic, n. 2); a surface of the second degree, a quadric surface or…

Geometry. A ruled surface; the surface swept out by a straight line which moves such that it never crosses its own path.

a complex manifold of complex dimension one; esp. a branched covering of the complex plane, which can be used in plotting multi-valued functions.

Geometry. The envelope of a quadric surface which touches eight given straight lines.

Mathematics. A configuration, outline, or surface.

Geometry. = regulus, n. 5. (Cf. skew, adj. 2.)

a mathematically defined surface computed as a best fit to the sampled values of some parameter over an area of interest; so trend surface analysis.