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Revolution :: Revolution (n.) The motion of a point, line, or surface about a point or line as its center or axis, in such a manner that a moving point generates a curve, a moving line a surface (called a surface of revolution), and a moving surface a solid (called a solid of revolution); as, the revolution of a right-angled triangle about one of its sides generates a cone; the revolution of a semicircle about the diameter generates a sphere..

Vacuum :: Vacuum (n.) The condition of rarefaction, or reduction of pressure below that of the atmosphere, in a vessel, as the condenser of a steam engine, which is nearly exhausted of air or steam, etc.; as, a vacuum of 26 inches of mercury, or 13 pounds per square inch..

High-pressure :: High-pressure (a.) Having or involving a pressure greatly exceeding that of the atmosphere; -- said of steam, air, water, etc., and of steam, air, or hydraulic engines, water wheels, etc..

Spheric :: Spheric (a.) Of or pertaining to the heavenly orbs, or to the sphere or spheres in which, according to ancient astronomy and astrology, they were set..

Atmosphere :: Atmosphere (n.) Any surrounding or pervading influence or condition.

Twilight :: Twilight (n.) The light perceived before the rising, and after the setting, of the sun, or when the sun is less than 18? below the horizon, occasioned by the illumination of the earth's atmosphere by the direct rays of the sun and their reflection on the earth..

Coccosphere :: Coccosphere (n.) A small, rounded, marine organism, capable of braking up into coccoliths..

Meteorological :: Meteorological (a.) Of or pertaining to the atmosphere and its phenomena, or to meteorology..

Drum :: Drum (n.) An instrument of percussion, consisting either of a hollow cylinder, over each end of which is stretched a piece of skin or vellum, to be beaten with a stick; or of a metallic hemisphere (kettledrum) with a single piece of skin to be so beaten; the common instrument for marking time in martial music; one of the pair of tympani in an orchestra, or cavalry band..

Ensphere :: Ensphere (v. t.) To place in a sphere; to envelop.

Lee :: Lee (n.) That part of the hemisphere, as one stands on shipboard, toward which the wind blows. See Lee, a..

Westness :: Westness (n.) A watery or moist state of the atmosphere; a state of being rainy, foggy, or misty; as, the wetness of weather or the season..

Claustrum :: Claustrum (n.) A thin lamina of gray matter in each cerebral hemisphere of the brain of man.

Lift :: Lift (n.) The sky; the atmosphere; the firmament.

Meteorology :: Meteorology (n.) The science which treats of the atmosphere and its phenomena, particularly of its variations of heat and moisture, of its winds, storms, etc..

Globe :: Globe (n.) A round or spherical body, solid or hollow; a body whose surface is in every part equidistant from the center; a ball; a sphere..

Semispherical :: Semispherical (a.) Having the figure of a half sphere.

Looming :: Looming (n.) The indistinct and magnified appearance of objects seen in particular states of the atmosphere. See Mirage.

Hygroscope :: Hygroscope (n.) An instrument which shows whether there is more or less moisture in the atmosphere, without indicating its amount..

Rare :: Rare (superl.) Characterized by wide separation of parts; of loose texture; not thick or dense; thin; as, a rare atmosphere at high elevations..

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