Hemisphere
Hemisphere , noun
[Latin hemisphaerium, Greek {not transcribed}; {not transcribed} half = {not transcribed} sphere: compare French 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.
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.
Collocations (2)
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hemispheres (Physics) , two hemispherical cups forming, when placed together, a cavity from which the air can be withdrawn by an air pump; -- used to illustrate the pressure of the air.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.