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Lens :: Lens (n.) A piece of glass, or other transparent substance, ground with two opposite regular surfaces, either both curved, or one curved and the other plane, and commonly used, either singly or combined, in optical instruments, for changing the direction of rays of light, and thus magnifying objects, or otherwise modifying vision. In practice, the curved surfaces are usually spherical, though rarely cylindrical, or of some other figure..

Zodiacal :: Zodiacal (a.) Of or pertaining to the zodiac; situated within the zodiac; as, the zodiacal planets..

Ramp :: Ramp (n.) An inclined plane serving as a communication between different interior levels.

Projection :: Projection (n.) The representation of something; delineation; plan; especially, the representation of any object on a perspective plane, or such a delineation as would result were the chief points of the object thrown forward upon the plane, each in the direction of a line drawn through it from a given point of sight, or central point; as, the projection of a sphere. The several kinds of projection differ according to the assumed point of sight and plane of projection in each..

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

Fillister :: Fillister (n.) A plane for making a rabbet.

Aeroplane :: Aeroplane (n.) A flying machine, or a small plane for experiments on flying, which floats in the air only when propelled through it..

Orb :: Orb (n.) A spherical body; a globe; especially, one of the celestial spheres; a sun, planet, or star..

Plano-concave :: Plano-concave (a.) Plane or flat on one side, and concave on the other; as, a plano-concave lens. See Lens..

Linkage :: Linkage (n.) A system of straight lines or bars, fastened together by joints, and having certain of their points fixed in a plane. It is used to describe straight lines and curves in the plane..

Primum Mobile :: Primum mobile () In the Ptolemaic system, the outermost of the revolving concentric spheres constituting the universe, the motion of which was supposed to carry with it all the inclosed spheres with their planets in a daily revolution from east to west. See Crystalline heavens, under Crystalline..

Semilens :: Semilens (n.) The half of a lens divided along a plane passing through its axis.

Perihelium :: Perihelium (n.) That point of the orbit of a planet or comet which is nearest to the sun; -- opposed to aphelion.

Planimetry :: Planimetry (n.) The mensuration of plane surfaces; -- distinguished from stereometry, or the mensuration of volumes..

Talisman :: Talisman (n.) A magical figure cut or engraved under certain superstitious observances of the configuration of the heavens, to which wonderful effects are ascribed; the seal, figure, character, or image, of a heavenly sign, constellation, or planet, engraved on a sympathetic stone, or on a metal corresponding to the star, in order to receive its influence..

Falcated :: Falcated (a.) Hooked or bent like a sickle; as, a falcate leaf; a falcate claw; -- said also of the moon, or a planet, when horned or crescent-formed..

Hendecagon :: Hendecagon (n.) A plane figure of eleven sides and eleven angles.

Superposition :: Superpose (v. t.) To lay (a figure) upon another in such a manner that all the parts of the one coincide with the parts of the other; as, to superpose one plane figure on another..

Belt :: Belt (n.) One of certain girdles or zones on the surface of the planets Jupiter and Saturn, supposed to be of the nature of clouds..

Moon :: Moon (n.) The celestial orb which revolves round the earth; the satellite of the earth; a secondary planet, whose light, borrowed from the sun, is reflected to the earth, and serves to dispel the darkness of night. The diameter of the moon is 2,160 miles, its mean distance from the earth is 240,000 miles, and its mass is one eightieth that of the earth. See Lunar month, under Month..

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