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A variety of twilled fabric ribbed on the surface.

The sharp edge or salient angle formed by two surfaces meeting each other, whether plane or curved; -- applied particularly to the edges in moldings, and to the raised edges which separate the flutings in a Doric column. P. Cyc. Arris fillet, a triangular piece of wood used to raise the slates of a roof against a chimn…

A peculiar transparent worm of the genus Sagitta, living at the surface of the sea. See Sagitta.

A form of diarthrodial articulation in which the articular surfaces are nearly flat, so that they form only an imperfect ball and socket.

Look, or particular appearance of the face; countenance; mien; air. "Serious in aspect." Dryden. [Craggs] with aspect open shall erect his head. Pope.

To make rough or uneven. The asperated part of its surface. Boyle.

Roughness of surface; unevenness; -- opposed to smoothness. "The asperities of dry bodies." Boyle.

Having an indefinite number of small charges scattered or strewed over the surface. Cussans.

compact native bitumen. It is brittle, of a black or brown color and high luster on a surface of fracture; it melts and burns when heated, leaving no residue. It occurs on the surface and shores of the Dead Sea, which is therefore called Asphaltites, or the Asphaltic Lake. It is found also in many parts of Asia, Europ…

is said to be astay, in heaving it, an acute angle is formed between the cable and the surface of the water.

A convex molding of rounded surface, generally from half to three quarters of a circle.

An old astronomical instrument, formed of two cones, on whose surface the constellations were delineated.

A genus of small glassy heteropod mollusks found swimming at the surface in mid ocean. See Heteropod.

An instrument for measuring the rate of evaporation from a moist surface; an evaporometer. Huxley.

The pressure or weight of the air at the sea level, on a unit of surface, or about 14.7 Ibs. to the sq. inch. Hydrogen was liquefied under a pressure of 650 atmospheres. Lubbock.

Melancholic or hypochondriac; atrabiliary. Dunglision. A hard-faced, atrabilious, earnest-eyed race. Lowell. He was constitutionally atrabilious and scornful. Froude.

A substance which, by irritating the surface, excites action in the part to which it is applied, as a blister, an epispastic, a sinapism.

- said of a rock or strip of shore, or (Naut.) of an anchor, etc., when flush with the surface of the water, so that the waves break over it.

Feathers connecting the under surface of the wing and the body, and concealed by the closed wing.

Axis of a lens, the straight line passing through its center and perpendicular to its surfaces. -- Axis of a telescope or microscope, the straight line with which coincide the axes of the several lenses which compose it. -- Axes of coördinates in a plane, to straight lines intersecting each other, to which points ar…