one half of the earth, especially the half above or below the equator （地球的）半球；（尤指）北半球，南半球 the northern/southern hemisphere 北半球；南半球 In the northern hemisphere, December is a winter month. 在北半球，12月是冬季的月份。
- (also cerebral hemisphere)
either half of the brain （大脑的）半球 the left/right hemisphere of the brain 大脑的左/右半球
one half of a sphere （球体的）半球
Word Originlate 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’.