hemisphere
/ˈhemɪˌsfɪə(r)/noun
1- a half of a sphere半球, 半球体。
1.1
- a half of the earth, usually as divided into northern and southern halves by the equator, or into western and eastern halves by an imaginary line passing through the poles（地球的）半球。
1.2
- a half of the celestial sphere（天球的）半球。
1.3
- （亦作cerebral hemisphere）each of the two parts of the cerebrum (left and right) in the brain of a vertebrate（脊椎动物的）大脑半球。
派生词
hemispheric
adjectivehemispherical
adjectivehemispherically
adverb词源
late Middle English （in the sense 'half the celestial sphere, the sky'）： from Old French emisphere, via Latin from Greek hēmisphairion, from hēmi- 'half' + sphaira 'sphere'.