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One who flies in an aëroplane.

A form of hydro-aëroplane; a flying boat.

(Aëronautics) A small plane or surface capable of being manipulated by the pilot of a flying machine to preserve or destroy lateral balance; a hinged wing tip; a lateral stabilizing or balancing plane.

Any device, as a balloon, aëroplane, etc., for floating in, or flying through, the air.

Alignment; position in a straight line, as of two planets with the sun. Whewell. The allineation of the two planets. C. A. Young.

An orthographic projection of the sphere on the plane of the meridian, the eye being supposed at an infinite distance, and in the east or west point of the horizon.

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.

by a quarter circle). -- Solid angle, the figure formed by the meeting of three or more plane angles at one point. -- Spherical angle, one made by the meeting of two arcs of great circles, which mutually cut one another on the surface of a globe or sphere. -- Visual angle, the angle formed by two rays of light, or…

ance. -- Angular motion, the motion of a body about a fixed point or fixed axis, as of a planet or pendulum. It is equal to the angle passed over at the point or axis by a line drawn to the body. -- Angular point, the point at which the sides of the angle meet; the vertex. -- Angular velocity, the ratio of anuglar m…

The solid formed by a circle revolving around a line which is the plane of the circle but does not cut it.

Pertaining to the anomaly, or angular distance of a planet from its perihelion. Anomalistic month. See under Month. -- Anomalistic revolution, the period in which a planet or satellite goes through the complete cycles of its changes of anomaly, or from any point in its elliptic orbit to the same again. -- Anomalistic…

The angular distance of a planet from its perihelion, as seen from the sun. This is the true anomaly. The eccentric anomaly is a corresponding angle at the center of the elliptic orbit of the planet. The mean anomaly is what the anomaly would be if the planet's angular motion were uniform.

An apparent motion of a planet toward the west; retrogradation.

A structure of bedded rocks in which the beds on both sides of an axis or axial plane dip away from the axis; an anticlinal.

Straight lines or planes which make angles in some respect opposite in character to those made by parallel lines or planes.

That point of a planet's or comet's orbit which is most distant from the sun, the opposite point being the perihelion.

Striking against; impinging; as, the appulsive influence of the planets. P. Cyc.

One of the two points of an orbit, as of a planet or satellite, which are at the greatest and least distance from the central body, corresponding to the aphelion and perihelion of a planet, or to the apogee and perigee of the moon. The more distant is called the higher apsis; the other, the lower apsis; and the line jo…

Any plane surface, as of the floor of a room or church, or of the ground within an inclosure; an open space in a building. The Alban lake . . . looks like the area of some vast amphitheater. Addison.

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…