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Oxygen :: Oxygen (n.) A colorless, tasteless, odorless, gaseous element occurring in the free state in the atmosphere, of which it forms about 23 per cent by weight and about 21 per cent by volume, being slightly heavier than nitrogen. Symbol O. Atomic weight 15.96..

Meteor :: Meteor (n.) Specif.: A transient luminous body or appearance seen in the atmosphere, or in a more elevated region..

Dew :: Dew (n.) Moisture from the atmosphere condensed by cool bodies upon their surfaces, particularly at night..

Atmosphere :: Atmosphere (n.) The pressure or weight of the air at the sea level, on a unit of surface, or about 14.7 Ibs. to the sq. inch..

Hygroscopic :: Hygroscopic (a.) Having the property of readily inbibing moisture from the atmosphere, or of the becoming coated with a thin film of moisture, as glass, etc..

Anticyclone :: Anticyclone (n.) A movement of the atmosphere opposite in character, as regards direction of the wind and distribution of barometric pressure, to that of a cyclone..

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

Humid :: Humid (a.) Containing sensible moisture; damp; moist; as, a humidair or atmosphere; somewhat wet or watery; as, humid earth; consisting of water or vapor..

Air :: Air (n.) The fluid which we breathe, and which surrounds the earth; the atmosphere. It is invisible, inodorous, insipid, transparent, compressible, elastic, and ponderable..

Halo :: Halo (n.) A luminous circle, usually prismatically colored, round the sun or moon, and supposed to be caused by the refraction of light through crystals of ice in the atmosphere. Connected with halos there are often white bands, crosses, or arches, resulting from the same atmospheric conditions..

Atmosphere :: Atmosphere (n.) Any gaseous envelope or medium.

Hyperborean :: Hyperborean (a.) Northern; belonging to, or inhabiting, a region in very far north; most northern; hence, very cold; fright, as, a hyperborean coast or atmosphere..

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..

Dew-point :: Dew-point (n.) The temperature at which dew begins to form. It varies with the humidity and temperature of the atmosphere.

Meteoroid :: Meteoroid (n.) A small body moving through space, or revolving about the sun, which on entering the earth's atmosphere would be deflagrated and appear as a meteor..

Lightning :: Lightning (n.) A discharge of atmospheric electricity, accompanied by a vivid flash of light, commonly from one cloud to another, sometimes from a cloud to the earth. The sound produced by the electricity in passing rapidly through the atmosphere constitutes thunder..

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..

Ethereal :: Ethereal (a.) Pertaining to the hypothetical upper, purer air, or to the higher regions beyond the earth or beyond the atmosphere; celestial; as, ethereal space; ethereal regions..

Aerology :: Aerology (n.) That department of physics which treats of the atmosphere.

Smoky :: Smoky (superl.) Filled with smoke, or with a vapor resembling smoke; thick; as, a smoky atmosphere..

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