English definition of Sphere

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Definition of sphere

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Sphere (n.) The apparent surface of the heavens, which is assumed to be spherical and everywhere equally distant, in which the heavenly bodies appear to have their places, and on which the various astronomical circles, as of right ascension and declination, the equator, ecliptic, etc., are conceived to be drawn; an ideal geometrical sphere, with the astronomical and geographical circles in their proper positions on it..

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

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..

Undersphere :: Undersphere (n.) A sphere which is smaller than, and in its movements subject to, another; a satellite..

Circumference :: Circumference (n.) The external surface of a sphere, or of any orbicular body..

Morula :: Morula (n.) The sphere or globular mass of cells (blastomeres), formed by the clevage of the ovum or egg in the first stages of its development; -- called also mulberry mass, segmentation sphere, and blastosphere. See Segmentation..

Ozonometer :: Ozonometer (n.) An instrument for ascertaining the amount of ozone in the atmosphere, or in any gaseous mixture..

Still :: Still (adv.) Not disturbed by noise or agitation; quiet; calm; as, a still evening; a still atmosphere..

Argo :: Argo (n.) A large constellation in the southern hemisphere, called also Argo Navis. In modern astronomy it is replaced by its three divisions, Carina, Puppis, and Vela..

Mundane :: Mundane (a.) Of or pertaining to the world; worldly; earthly; terrestrial; as, the mundane sphere..

Analemma :: Analemma (n.) An instrument of wood or brass, on which this projection of the sphere is made, having a movable horizon or cursor; -- formerly much used in solving some common astronomical problems..

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..

Blastosphere :: Blastosphere (n.) The hollow globe or sphere formed by the arrangement of the blastomeres on the periphery of an impregnated ovum.

Astrolabe :: Astrolabe (n.) A stereographic projection of the sphere on the plane of a great circle, as the equator, or a meridian; a planisphere..

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..

Hyperorganic :: Hyperorganic (a.) Higher than, or beyond the sphere of, the organic..

Callosum :: Callosum (n.) The great band commissural fibers which unites the two cerebral hemispheres. See corpus callosum, under Carpus..

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.

Sphericle :: Sphericle (n.) A small sphere.

Planisphere :: Planisphere (n.) The representation of the circles of the sphere upon a plane; especially, a representation of the celestial sphere upon a plane with adjustable circles, or other appendages, for showing the position of the heavens, the time of rising and setting of stars, etc., for any given date or hour..

Chromatosphere :: Chromatosphere (n.) A chromosphere.