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f free-swimming marine worms, of which the genus Sagitta is the type. They have groups of curved spines on each side of the head.

A right line uniting the extremities of the arc of a circle or curve.

Crow family (Fregilus graculus) of Europe. It is of a black color, with a long, slender, curved bill and red legs; -- also called chauk, chauk-daw, chocard, Cornish chough, red-legged crow. The name is also applied to several allied birds, as the Alpine chough. Cornish chough (Her.), a bird represented black, with red…

A plane figure, bounded by a single curve line called its circumference, every part of which is equally distant from a point within it, called the center.

Circular are, any portion of the circumference of a circle. -- Circular cubics (Math.), curves of the third order which are imagined to pass through the two circular points at infinity. -- Circular functions. (Math.) See under Function. -- Circular instruments, mathematical instruments employed for measuring angles…

Curved circularly; -- applied to several arteries of the hip and thigh, to arteries, veins, and a nerve of the shoulder, and to other parts.

The act of bending, or causing to assume a curved form.

omposed of several pieces. From the opening of the shell the animal throws out a group of curved legs, looking like a delicate curl, whence the name of the group. See Anatifa.

A curve invented by Diocles, for the purpose of solving two celebrated problems of the higher geometry; viz., to trisect a plane angle, and to construct two geometrical means between two given straight lines.

congregation is divided, and which is under the supervision of a class leader. Class of a curve (Math.), the kind of a curve as expressed by the number of tangents that can be drawn from any point to the curve. A circle is of the second class. -- Class meeting (Methodist Church), a meeting of a class under the charge…

Anything resembling the claw of an animal, as the curved and forked end of a hammer for drawing nails.

A bird of the Parrot family, of the subfamily Cacatuinæ, having a short, strong, and much curved beak, and the head ornamented with a crest, which can be raised or depressed at will. There are several genera and many species; as the broad-crested (Plictolophus, or Cacatua, cristatus), the sulphur-crested (P. galeritus)…

Hollow-seeded; having the ventral face of the seedlike carpels incurved at the ends, as in coriander seed.

nvex in the direction of its length on the under side, for smoothing the concave faces of curved woodwork. -- Compass plant, Compass flower (Bot.), a plant of the American prairies (Silphium laciniatum), not unlike a small sunflower; rosinweed. Its lower and root leaves are vertical, and on the prairies are disposed t…

Curved; bent; as, compassing timbers.

hich satisfy a single relation constitute a complex; as, all the lines which meet a given curve make up a complex. The lines which satisfy two relations constitute a congruency of lines; as, the entire system of lines, each one of which meets two given surfaces, is a congruency.

te tinctures in a single row; -- said of any bearing; or, in the case of a bearing having curved lines, divided into patches of alternate colors following the curve. If there are two rows it is called counter-compony.

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 kind of spiral curve found in certain univalve shells. Agassiz.

A curve, of the fourth degree, first made use of by the Greek geometer, Nicomedes, who invented it for the purpose of trisecting an angle and duplicating the cube.