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(), n.[L. hemisphaerium, Gr. ; half = sphere: cf. F. hmisphre. See Hemi-, and Sphere.] 1. A half sphere; one half of a sphere or globe, when divided by a plane passing through its center. 2. Half of the terrestrial globe, or a projection of the same in a map or picture. 3. The people who inhabit a hemisphere. He died . . . mourned by a hemisphere. J. P. Peters. Cerebral hemispheres. (Anat.) See Brain. Magdeburg hemispheres (Physics), two hemispherical cups forming, when placed together, a cavity from which the air can be withdrawn by an air pump; -- used to illustrate the pressure of the air. So called because invented by Otto von Guericke at Magdeburg. スポンサード リンク
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