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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..

Tropic :: Tropic (n.) One of the two small circles of the celestial sphere, situated on each side of the equator, at a distance of 23? 28/, and parallel to it, which the sun just reaches at its greatest declination north or south, and from which it turns again toward the equator, the northern circle being called the Tropic of Cancer, and the southern the Tropic of Capricorn, from the names of the two signs at which they touch the ecliptic..

Almucantar :: Almucantar (n.) A small circle of the sphere parallel to the horizon; a circle or parallel of altitude. Two stars which have the same almucantar have the same altitude. See Almacantar.

Gastrula :: Gastrula (n.) An embryonic form having its origin in the invagination or pushing in of the wall of the planula or blastula (the blastosphere) on one side, thus giving rise to a double-walled sac, with one opening or mouth (the blastopore) which leads into the cavity (the archenteron) lined by the inner wall (the hypoblast). See Illust. under Invagination. In a more general sense, an ideal stage in embryonic development. See Gastraea..

Weatherglass :: Weatherglass (n.) An instrument to indicate the state of the atmosphere, especially changes of atmospheric pressure, and hence changes of weather, as a barometer or baroscope..

Atmospherical :: Atmospherical (a.) Of or pertaining to the atmosphere; of the nature of, or resembling, the atmosphere; as, atmospheric air; the atmospheric envelope of the earth..

Analemma :: Analemma (n.) 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..

Hygrometry :: Hygrometry (n.) That branch of physics which relates to the determination of the humidity of bodies, particularly of the atmosphere, with the theory and use of the instruments constructed for this purpose..

Bear :: Bear (n.) One of two constellations in the northern hemisphere, called respectively the Great Bear and the Lesser Bear, or Ursa Major and Ursa Minor..

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..

Paragrele :: Paragrele (n.) A lightning conductor erected, as in a vineyard, for drawing off the electricity in the atmosphere in order to prevent hailstorms..

Atmosphere :: Atmosphere (n.) The portion of air in any locality, or affected by a special physical or sanitary condition; as, the atmosphere of the room; a moist or noxious atmosphere..

Zenith :: Zenith (n.) That point in the visible celestial hemisphere which is vertical to the spectator; the point of the heavens directly overhead; -- opposed to nadir.

Ovate-rotundate :: Ovate-rotundate (a.) Having a form intermediate between that of an egg and a sphere; roundly ovate.

Spheric :: Spheric (a.) Having the form of a sphere; like a sphere; globular; orbicular; as, a spherical body..

Spermosphere :: Spermosphere (n.) A mass or ball of cells formed by the repeated division of a male germinal cell (spermospore), each constituent cell (spermoblast) of which is converted into a spermatozoid; a spermatogemma..

Eccentric :: Eccentric (a.) Deviating from stated methods, usual practice, or established forms or laws; deviating from an appointed sphere or way; departing from the usual course; irregular; anomalous; odd; as, eccentric conduct..

Diameter :: Diameter (n.) Any right line passing through the center of a figure or body, as a circle, conic section, sphere, cube, etc., and terminated by the opposite boundaries; a straight line which bisects a system of parallel chords drawn in a curve..

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

Cloud :: Cloud (n.) A collection of visible vapor, or watery particles, suspended in the upper atmosphere..

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