English definition of Sphere

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Definition of sphere

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Sphere (n.) In ancient astronomy, one of the concentric and eccentric revolving spherical transparent shells in which the stars, sun, planets, and moon were supposed to be set, and by which they were carried, in such a manner as to produce their apparent motions..

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Polar :: Polar (a.) Of or pertaining to one of the poles of the earth, or of a sphere; situated near, or proceeding from, one of the poles; as, polar regions; polar seas; polar winds..

Autonomy :: Autonomy (n.) The sovereignty of reason in the sphere of morals; or man's power, as possessed of reason, to give law to himself. In this, according to Kant, consist the true nature and only possible proof of liberty..

Physiography :: Physiography (n.) The science which treats of the earth's exterior physical features, climate, life, etc., and of the physical movements or changes on the earth's surface, as the currents of the atmosphere and ocean, the secular variations in heat, moisture, magnetism, etc.; physical geography..

Humidity :: Humidity (n.) Moisture; dampness; a moderate degree of wetness, which is perceptible to the eye or touch; -- used especially of the atmosphere, or of anything which has absorbed moisture from the atmosphere, as clothing..

Trepidation :: Trepidation (n.) A libration of the starry sphere in the Ptolemaic system; a motion ascribed to the firmament, to account for certain small changes in the position of the ecliptic and of the stars..

Undersphere :: Undersphere (n.) An inferior sphere, or field of action..

Hydrus :: Hydrus (n.) A constellation of the southern hemisphere, near the south pole..

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..

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

Cosmosphere :: Cosmosphere (n.) An apparatus for showing the position of the earth, at any given time, with respect to the fixed stars. It consist of a hollow glass globe, on which are depicted the stars and constellations, and within which is a terrestrial globe..

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

Leucosphere :: Leucosphere (n.) The inner corona.

Exterior :: Exterior (a.) External; outward; pertaining to that which is external; -- opposed to interior; as, the exterior part of a sphere..

Pole :: Pole (n.) Either extremity of an axis of a sphere; especially, one of the extremities of the earth's axis; as, the north pole..

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

Noncondensing :: Noncondensing (a.) Not condensing; discharging the steam from the cylinder at a pressure nearly equal to or above that of the atmosphere and not into a condenser.

Air :: Air (n.) A particular state of the atmosphere, as respects heat, cold, moisture, etc., or as affecting the sensations; as, a smoky air, a damp air, the morning air, etc..

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..

Nadir :: Nadir (n.) That point of the heavens, or lower hemisphere, directly opposite the zenith; the inferior pole of the horizon; the point of the celestial sphere directly under the place where we stand..

Quadric :: Quadric (n.) A surface whose equation in three variables is of the second degree. Spheres, spheroids, ellipsoids, paraboloids, hyperboloids, also cones and cylinders with circular bases, are quadrics..