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ast. -- Hard finish (Arch.), a smooth finishing coat of hard fine plaster applied to the surface of rough plastering. -- Hard lines, hardship; difficult conditions. -- Hard money, coin or specie, as distinguished from paper money. -- Hard oyster (Zoöl.), the northern native oyster. [Local, U. S.] - - Hard pan, the…

That which hardens, as a material used for converting the surface of iron into steel.

The cohesion of the particles on the surface of a body, determined by its capacity to scratch another, or be itself scratched;-measured among minerals on a scale of which diamond and talc form the extremes.

r form for a large class of physical problems, involving arbitrary data, over a spherical surface, and the deduction of solutions for every point of space. The functions employed in this method are called spherical harmonic functions. Thomson & Tait. -- Harmonic suture (Anat.), an articulation by simple apposition of…

To draw a harrow over, as for the purpose of breaking clods and leveling the surface, or for covering seed; as, to harrow land. Will he harrow the valleys after thee Job xxxix. 10.

violent chilling, as by a spray of cold water. This process gives an armor plate a thick surface of extreme hardness supported by material gradually decreasing in hardness to the unaltered soft steel at the back.

An instrument for cutting the surface of grass land; a scarifier.

river; as, the head of the Nile; hence, the altitude of the source, or the height of the surface, as of water, above a given place, as above an orifice at which it issues, and the pressure resulting from the height or from motion; sometimes also, the quantity in reserve; as, a mill or reservoir has a good head of wate…

A brick or stone laid with its shorter face or head in the surface of the wall.

mth 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.…

A contrivance for multiple copying, by means of a surface of gelatin softened with glycerin. [Written also hectograph.]

ands, above the earth, or above the level of the sea; altitude; the measure upward from a surface, as the floor or the ground, of animal, especially of a man; stature. Bacon. [Goliath's] height was six cubits and a span. 1 Sam. xvii. 4.

A warped surface which may be generated by a straight line moving in such a manner that every point of the line shall have a uniform motion in the direction of another fixed straight line, and at the same time a uniform angular motion about it.

One of the sinuous tracks on the surfaces of many stones, and popularly considered as worm trails.

such quantities as are incapable of being compared together in respect to magnitude, and surfaces and solids. -- Heterogeneous surds (Math.), surds having different radical signs.

Elevated above any starting point of measurement, as a line, or surface; having altitude; lifted up; raised or extended in the direction of the zenith; lofty; tall; as, a high mountain, tower, tree; the sun is high.

Abounding with hills; uneven in surface; as, a hilly country. "Hilly steep." Dryden.

An upward curve or very obtuse angle in the upper surface of any member, as of a timber laid horizontally; -- the opposite of camber.

A low spot surrounded by elevations; a depressed part of a surface; a concavity; a channel. Forests grew Upon the barren hollows. Prior. I hate the dreadful hollow behind the little wood. Tennyson.

Flat; even; -- a term applied to surfaces and to spaces, whether real or imagined, in which the definitions, axioms, and postulates of Euclid respecting parallel straight lines are assumed to hold true.