Longman Dictionary of Contemporary English homepage

Topic: BIOLOGY

Date: 1500-1600
Language: Latin
Origin: hemisphaerium, from Greek, from hemi- 'half' + sphairion 'small sphere'

hemisphere

noun
     
hem‧i‧sphere [countable]
1 a half of the earth, especially one of the halves above and below the equator:
the Northern hemisphere
2HB one of the two halves of your brain
3CF half of a sphere (=an object which is round like a ball)
hemispherical adjective
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