from
The Collaborative International Dictionary of English v.0.48
Hemisphere \Hem"i*sphere\, n. [L. hemisphaerium, Gr. ?; ? half =
? sphere: cf. F. h['e]misph[`e]re. 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.
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3. The people who inhabit a hemisphere.
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He died . . . mourned by a hemisphere. --J. P.
Peters.
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{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can be withdrawn by an air pump; -- used to illustrate the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. Hemispheric