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n. The exterior part of anything that has length and breadth; one of the limits that bound a solid, esp. the upper face; superficies; the outside; as, the surface of the earth; the surface of a diamond; the surface of the body. Hence, outward or external appearance.

 - (Geom.) A magnitude that has length and breadth without thickness; superficies; as, a plane surface; a spherical surface.

 - (Fort.) That part of the side which is terminated by the flank prolonged, and the angle of the nearest bastion. Caustic surface, Heating surface, etc. See under Caustic, Heating, etc.

 - Surface condensation, Surface condenser. See under Condensation, and Condenser.

 - Surface gauge (Mach.), an instrument consisting of a standard having a flat base and carrying an adjustable pointer, for gauging the evenness of a surface or its height, or for marking a line parallel with a surface.

 - Surface grub (Zool.), the larva of the great yellow underwing moth (Triphœna pronuba). It is often destructive to the roots of grasses and other plants.

 - Surface plate (Mach.), a plate having an accurately dressed flat surface, used as a ...

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