Hemisphere

hem′i-sfēr, n. a half-sphere: half of the globe or a map of it.— adjs. Hemispher′ic , -al .— n. Hemisphē′roid , the half of a spheroid.— adj. Hemispheroi′dal .— Eastern and Western hemispheres , the eastern and western halves of the terrestrial globe, the former including Europe, Asia, and Africa; the latter, the Americas. [Gr. hēmisphairion — hēmi- , half, sphaira , a sphere.]