*hemisphere*

n. [ L. hemisphaerium, Gr. &unr_;; &unr_; half = &unr_; sphere: cf. F. hémisphère. See Hemi-, and Sphere. ] 1. A half sphere; one half of a sphere or globe, when divided by a plane passing through its center. [ 1913 Webster ]

2. Half of the terrestrial globe, or a projection of the same in a map or picture. [ 1913 Webster ]

3. The people who inhabit a hemisphere. [ 1913 Webster ]

He died . . . mourned by a hemisphere. J. P. Peters. [ 1913 Webster ]

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hemispheres (Physics), two hemispherical cups forming, when placed together, a cavity from which the air can be withdrawn by an air pump; -- used to illustrate the pressure of the air.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.