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Not changed in form by inversion. Anallagmatic curves, a class of curves of the fourth degree which have certain peculiar relations to circles; -- sometimes called bicircular quartics. -- Anallagmatic surfaces, a certain class of surfaces of the fourth degree.

A distorted or monstrous projection or representation of an image on a plane or curved surface, which, when viewed from a certain point, or as reflected from a curved mirror or through a polyhedron, appears regular and in proportion; a deformation of an image.

e bead, often having a capital or base, or both. -- Curvilineal angle, one formed by two curved lines. -- External angles, angles formed by the sides of any right-lined figure, when the sides are produced or lengthened. -- Facial angle. See under Facial. -- Internal angles, those which are within any right-lined fi…

The angle between the tangent to the advancing edge (of an aërocurve) and the line of motion; -- contrasted with angle of trail, which is the angle between the tangent to the following edge and the line of motion.

The angle between the chord of an aërocurve and the relative direction of the undisturbed air current.

Curved somewhat in the form of the letter S. Cussans.

Having to opposite curvatures, that is, curved longitudinally in one direction and transversely in the opposite direction, as the surface of a saddle.

The curved elevation of the cartilage of the ear, within or in front of the helix. See Ear.

An ornamental appendage of wood at the ship's stern, usually spreading like a fan and curved like a bird's feather. Audsley.

, right line applied at right angles to the axis of any conic section, and bounded by the curve.

In a curve referred to polar coördinates, any point for which the radius vector is a maximum or minimum.

A portion of a curved line; as, the arc of a circle or of an ellipse.

Any part of a curved line.

Made with an arch or curve; covered with an arch; as, an arched door.

The architectural member surrounding the curved opening of an arch, corresponding to the architrave in the case of a square opening.

Having the form of an arch; curved.

Bent or curved in the form of a bow. "Arcuate stalks." Gray.

of calcite, or carbonate of lime, having a silvery-white, pearly luster, and a waving or curved lamellar structure.

Shaped like a bow; arcuate; curved. [R.]

e 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 chimney…