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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..

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..

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

Extensive :: Extensive (a.) Having wide extent; of much superficial extent; expanded; large; broad; wide; comprehensive; as, an extensive farm; an extensive lake; an extensive sphere of operations; extensive benevolence; extensive greatness..

Spermatogemma :: Spermatogemma (n.) Same as Spermosphere.

Insphere :: Insphere (v. t.) To place in, or as in, an orb a sphere. Cf. Ensphere..

Hemispheroidal :: Hemispheroidal (a.) Resembling, or approximating to, a hemisphere in form..

Purview :: Purview (n.) Limit or sphere of authority; scope; extent.

Unsphere :: Unsphere (v. t.) To remove, as a planet, from its sphere or orb..

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

Ellipticity :: Ellipticity (n.) Deviation of an ellipse or a spheroid from the form of a circle or a sphere; especially, in reference to the figure of the earth, the difference between the equatorial and polar semidiameters, divided by the equatorial; thus, the ellipticity of the earth is /..

Subspinous :: Subspherical (a.) Nearly spherical; having a figure resembling that of a sphere.

Arena :: Arena (n.) Any place of public contest or exertion; any sphere of action; as, the arenaof debate; the arena of life..

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..

Spherics :: Spherics (n.) The doctrine of the sphere; the science of the properties and relations of the circles, figures, and other magnitudes of a sphere, produced by planes intersecting it; spherical geometry and trigonometry..

Weather :: Weather (n.) The state of the air or atmosphere with respect to heat or cold, wetness or dryness, calm or storm, clearness or cloudiness, or any other meteorological phenomena; meteorological condition of the atmosphere; as, warm weather; cold weather; wet weather; dry weather, etc..

Meteoroscope :: Meteoroscope (n.) An astrolabe; a planisphere.

Point :: Point (n.) A fixed conventional place for reference, or zero of reckoning, in the heavens, usually the intersection of two or more great circles of the sphere, and named specifically in each case according to the position intended; as, the equinoctial points; the solstitial points; the nodal points; vertical points, etc. See Equinoctial Nodal..

Horse-chestnut :: Horse-chestnut (n.) The tree itself, which was brought from Constantinople in the beginning of the sixteenth century, and is now common in the temperate zones of both hemispheres. The native American species are called buckeyes..

Sphere :: 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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