The bright surface of this ethereous mold. Milton.

Vain and weak understandings, which penetrate no deeper than the surface. V. Knox.

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 (Zoöl.), 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 standard of flatness by which to test other surfaces. -- Surface printing, printing from a surface in relief, as from type, in distinction from plate printing, in which the ink is contained in engraved lines.