a half sphere
either of the two halves of the cerebrum of the brain
the northern or southern half of the earth divided by the equator or the eastern or western half divided by a meridian (imaginary circle passing through both poles)
a half of the celestial sphere when divided by the horizon, the celestial equator, or the ecliptic1 (apparent path of the sun)
= cerebral hemisphere
hemispheric /-ʹsferik/ adj
hemispherical /-ʹsferikl/ adj
hemispherically adv
[Middle English hemispere via Latin from Greek hēmisphairion, from hēmi- half + sphairion, dimin. of sphaira sphere1]