Hypertext Webster Gateway: "Hemisphere"

From Webster's Revised Unabridged Dictionary (1913) (web1913)

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.

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can be withdrawn by an air pump; -- used to illustrate the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.

From WordNet (r) 1.7 (wn)

hemisphere
n 1: half of the terrestrial globe
2: half of a sphere
3: either half of the cerebrum [syn: {cerebral hemisphere}]

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