Etymology
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hemisphere (n.)

late 14c., hemysperie, in reference to the celestial sphere, from Late Latin hemisphaerium, from Greek hēmisphairion, from hēmi- "half" (see hemi-) + sphaira "sphere" (see sphere). Spelling reformed 16c. Of the Earth, from 1550s; of the brain, 1804.

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Definitions of hemisphere

hemisphere (n.)
half of the terrestrial globe;
hemisphere (n.)
half of a sphere;
hemisphere (n.)
either half of the cerebrum;
Synonyms: cerebral hemisphere
From wordnet.princeton.edu