hemi·sphere /-ˌsfɪ(ə)r/ 名詞
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Magdeburg hemispheres Physics, two hemispherical cups forming, when placed together, a cavity from which the air can be withdrawn by an air pump; -- used to illustrate the pressure of the air.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.
n 1: half of the terrestrial globe
2: half of a sphere
3: either half of the cerebrum [syn: cerebral hemisphere]