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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 /..

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

Echinoidea :: Echinoidea (n. pl.) The class Echinodermata which includes the sea urchins. They have a calcareous, usually more or less spheroidal or disk-shaped, composed of many united plates, and covered with movable spines. See Spatangoid, Clypeastroid..

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..

Semispheroidal :: Semispheroidal (a.) Formed like a half spheroid.

Oblate :: Oblate (a.) Flattened or depressed at the poles; as, the earth is an oblate spheroid..

Spheroidic :: Spheroidic (a.) Alt. of Spheroidica.

Oblatum :: Oblatum (n.) An oblate spheroid; a figure described by the revolution of an ellipse about its minor axis. Cf. Oblongum.

Botryoidal :: Botryoidal (a.) Having the form of a bunch of grapes; like a cluster of grapes, as a mineral presenting an aggregation of small spherical or spheroidal prominences..

Spheroidical :: Spheroidical (a.) See Spheroidal.

Bulb :: Bulb (n.) A spheroidal body growing from a plant either above or below the ground (usually below), which is strictly a bud, consisting of a cluster of partially developed leaves, and producing, as it grows, a stem above, and roots below, as in the onion, tulip, etc. It differs from a corm in not being solid..

Spherosiderite :: Spherosiderite (n.) Siderite occuring in spheroidal masses.

Spheroid :: Spheroid (n.) A body or figure approaching to a sphere, but not perfectly spherical; esp., a solid generated by the revolution of an ellipse about one of its axes..

Oblongum :: Oblongum (n.) A prolate spheroid; a figure described by the revolution of an ellipse about its greater axis. Cf. Oblatum, and see Ellipsoid of revolution, under Ellipsoid..

Prolate :: Prolate (a.) Stretched out; extended; especially, elongated in the direction of a line joining the poles; as, a prolate spheroid; -- opposed to oblate..

Spheroidicity :: Spheroidicity (n.) Alt. of Spheroidit.

Spheroidity :: Spheroidity (n.) The quality or state of being spheroidal.

Dumb-bell :: Dumb-bell (n.) A weight, consisting of two spheres or spheroids, connected by a short bar for a handle; used (often in pairs) for gymnastic exercise..

Merenchyma :: Merenchyma (n.) Tissue composed of spheroidal cells.

Hemispheroid :: Hemispheroid (n.) A half of a spheroid.

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