The Collaborative International Dictionary
Surface \Sur"face`\, n. [F. See Sur-, and Face, and cf. Superficial.]
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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. -
Hence, outward or external appearance.
Vain and weak understandings, which penetrate no deeper than the surface.
--V. Knox. (Geom.) A magnitude that has length and breadth without thickness; superficies; as, a plane surface; a spherical surface.
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(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\ (h[=e]t"[i^]ng), 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.
Wiktionary
n. In a steam boiler, the aggregate surface exposed to fire or to the heated products of combustion, especially of all the plates or sheets that are exposed to water on their opposite surfaces.
Usage examples of "heating surface".
Disregarding the Stephenson Rocket, the total heating surface ranged from ~1,400 to ~6,100 square feet, and the grate areas from 20 to 100 square feet.
In one instance, where he had so far succeeded as to be allowed to heat the blast-main, he asked permission to introduce deflecting plates in the main or to put a bend in the pipe, so as to bring the blast more closely against the heated sides of the pipe, and also increase the area of heating surface, in order to raise the temperature to a higher point.
He put the heating surface of each one against the hull, and then tripped the automatic self-driving staples that would hold them tight to the wood.