The Collaborative International Dictionary of English v.0.48:
Surface \Sur"face`\, n. [F. See Sur-, and Face, and cf.
1. 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.
The bright surface of this ethereous mold. --Milton.
2. Hence, outward or external appearance.
Vain and weak understandings, which penetrate no
deeper than the surface. --V. Knox.
3. (Geom.) A magnitude that has length and breadth without
thickness; superficies; as, a plane surface; a spherical
4. (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 (Triphoena 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.