Source : Webster's Revised Unabridged Dictionary (1913)
Surface \Sur"face`\, n. [F. See {Sur-}, and {Face}, and cf.
{Superficial}.]
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
surface.
4. (Fort.) That part of the side which is terminated by the
flank prolonged, and the angle of the nearest bastion.
--Stocqueler.
{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} (Zo["o]l.), the larva of the great yellow
underwing moth ({Triph[oe]na 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.
Heating \Heat"ing\, a.
That heats or imparts heat; promoting warmth or heat;
exciting action; stimulating; as, heating medicines or
applications.
{Heating surface} (Steam Boilers), the aggregate surface
exposed to fire or to the heated products of combustion,
esp. of all the plates or sheets that are exposed to water
on their opposite surfaces; -- called also {fire surface}.