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A reverberatory furnace with a circular revolving hearth, -- used in making steel.

o center of any two adjacent teeth of gearing, measured on the pitch line; -- called also circular pitch.

Having the shape of a placenta, or circular thickened disk somewhat thinner about the middle.

a small and delicate bas-relief, whether cast or struck from a die, or of form other than circular.

A piece of DNA, usually circular, functioning as part of the genetic material of a cell, not integrated with the chromosome and replicating independently of the chromosome, but transferred, like the chromosome, to subsequent generations. In bacteria, plasmids often carry the genes for antibiotic resistance; they are ex…

A small, shallow, and usually circular, vessel of metal or wood, or of earth glazed and baked, from which food is eaten at table.

(Arch.) In classical architecture, a vertically faced member immediately below the circular base of a column; also, the lowest member of a pedestal; hence, in general, the lowest member of a base; a sub-base; a block upon which the moldings of an architrave or trim are stopped at the bottom. See Illust. of Column.…

A circular hole formed in the rocky beds of rivers by the grinding action of stones or gravel whirled round by the water in what was at first a natural depression of the rock.

A soft cushion, esp. one circular in shape and not, like a pilow, of bag form, or thin at the edges.

nd measuring angles on paper, used in drawing or in plotting. It is of various forms, semicircular, rectangular, or circular.

uner (Asemum moestum), whose larva eats the pith of oak branches, and when mature gnaws a circular furrow on the inside nearly to the bark. When the branches fall each contains a pupa.

ock drama performed by puppets moved by wires. -- Puppet valve, a valve in the form of a circular disk, which covers a hole in its seat, and opens by moving bodily away from the seat while remaining parallel with it, -- used in steam engines, pumps, safety valves, etc. Its edge is often beveled, and fits in a conical…

A pod which divides circularly into an upper and lower half, of which the former acts as a kind of lid, as in the pimpernel and purslane.

, having pockets to hold the weights prescribed. -- Race course. (a) The path, generally circular or elliptical, over which a race is run. (b) Same as Race way, below. -- Race cup, a cup given as a prize to the victor in a race. -- Race glass, a kind of field glass. -- Race horse. (a) A horse that runs in competiti…

One of the circular iron or steel rails on which the chassis of a heavy gun is turned.

hich it swings, and having its other end attached to a piece which it causes to move in a circular arc. -- Radius of curvature. See under Curvature.

The plunger of a hydraulic press. Ram's horn. (a) (Fort.) A low semicircular work situated in and commanding a ditch. [Written also ramshorn.] Farrow. (b) (Paleon.) An ammonite.

atchet wheel and pawl, by swinging the lever back and forth. -- Ratchet wheel (Mach.), a circular wheel having teeth, usually angular, with which a reciprocating pawl engages to turn the wheel forward, or a stationary pawl to hold it from turning backward.

f a compound flower, as an aster or a sunflower; one of the pedicels of an umbel or other circular flower cluster; radius. See Radius.

ike the hollow roar Of tides receding from the instituted shore. Dryden. All bodies moved circularly endeavor to recede from the center. Bentley.