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The condition of occupying the same place in space; as, the coincidence of circles, surfaces, etc. Bentley.

ium (Anat.), epithelium in which the cells are priismatic in form, and set upright on the surface they cover. -- Columnar structure (Geol.), a structure consisting of more or less regular columns, usually six-sided, but sometimes with eight or more sides. The columns are often fractured transversely, with a cup joint,…

To divide; to mark out into parts or subdivisions. [R.] The crystal surface is comparted all In niches verged with rubies. Glover.

An instrument for determining directions upon the carth's surface by means of a magnetized bar or needle turning freely upon a pivot and pinting in a northerly and southerly direction. He that firat discovered the use of the compass did more for the supplying and increase of useful commodities than those who built work…

Flattened to a level surface. [R.]

a congruency of lines; as, the entire system of lines, each one of which meets two given surfaces, is a congruency.

Hollow and curved or rounded; vaulted; -- said of the interior of a curved surface or line, as of the curve of the of the inner surface of an eggshell, in opposition to convex; as, a concave mirror; the concave arch of the sky.

A concave surface, or the space bounded by it; the state of being concave.

mon center, as circles of different size, one within another. Concentric circles upon the surface of the water. Sir I. Newton. Concentrical rings like those of an onion. Arbuthnot.

ions or depressions in form like one half of a bivalve shell; -- applied principally to a surface produced by fracture.

particles into one mass; united in a solid form. The first concrete state, or consistent surface, of the chaos must be of the same figure as the last liquid state. Bp. Burnet.

e union of two or more, with or without separation of some unimportant side products. -- Surface condensation, the system of condensing steam by contact with cold metallic surfaces, in distinction from condensation by the injection of cold water.

ction condenser, a vessel in which steam is condensed by the direct contact of water. -- Surface condenser, an apparatus for condensing steam, especially the exhaust of a steam engine, by bringing it into contact with metallic surface cooled by water or air.

ny prominence; particularly, an eminence at the end of a bone bearing a rounded articular surface; -- sometimes applied also to a concave articular surface.

led also a right cone. More generally, any solid having a vertical point and bounded by a surface which is described by a straight line always passing through that vertical point; a solid having a circle for its base and tapering to a point or vertex.

A friction clutch with conical bearing surfaces.

Characterized by having the pustules, etc., run together or unite, so as to cover the surface; as, confluent smallpox. Dunglison.

s, conic sections. Conic section (Geom.), a curved line formed by the intersection of the surface of a right cone and a plane. The conic sections are the parabola, ellipse, and hyperbola. The right lines and the circle which result from certain positions of the plane are sometimes, though not generally included. -- Co…

The mucous membrane which covers the external surface of the ball of the eye and the inner surface of the lids; the conjunctival membrance.

A surface which may be generated by a straight line moving in such a manner as always to meet a given straight line and a given curve, and continue parallel to a given plane. Math. Dict.