(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.

plural of surface area

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

(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

(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.

(aeronautics) A moveable surface attached to a machine such as an aircraft or submarine that can be used to control the machine's motion in roll, pitch or yaw.

interfacial energy

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

(optics) A surface to which rays reflected or refracted by another surface are tangents.

capable of lowering the surface tension of a liquid