(mathematics) A one-dimensional complex manifold; a generalization of the complex plane.

(geography) Water collecting on the ground or in a stream, river, lake, sea or ocean, as opposed to groundwater.

(mathematics) A surface formed when a given curve is revolved around a given axis. If the resulting surface is a closed one, it also defines a solid of revolution.

plural of control surface

(differential geometry) A unit vector at any given point P of a surface M which is perpendicular to the tangent plane T_P(M) of M at P. For a surface with parametrization ⃑x(u,v), it is given by

(physics) An abstract boundary, of constant energy, useful for predicting the thermal, electrical, magnetic, and optical properties of metals, semimetals, and doped semiconductors.

(physics) A quantized electromagnetic wave trapped at a metallic surface through interaction with the free electrons of the metal.

interfacial energy

Alternative spelling of subsurface

(geometry) The total area on the surface of an object. / (computing) The total resources of a system that are accessible from the outside world and thus might be attacked.