Hem"i*sphere(?), 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hemispheres (Physics), two hemispherical cups forming, when placed together, a cavity from which the air can be withdrawn by an air pump; -- used to illustrate the pressure of the air.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.
Hem`i*spher"ic*al(?), } a. [Cf. F. hmisphrique.] Containing, or pertaining to, a hemisphere; as, a hemispheric figure or form; a hemispherical body.
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Wed 16th October 2019