hem‧i‧sphere /ˈheməsfɪə, ˈhemɪsfɪə $ -fɪr/ noun [countable]
[Date: 1500-1600; Language: Latin; Origin: hemisphaerium, from Greek, from hemi- 'half' + sphairion 'small sphere']

1. a half of the Earth, especially one of the halves above and below the equator:
the Northern hemisphere

2. one of the two halves of your brain

3. half of a sphere (=an object which is round like a ball)
—hemispherical /ˌheməˈsferəkəl, ˌhemɪˈsferəkəl/ adjective

[TahlilGaran] Dictionary of Contemporary English ▲