Hĕm'i-sphēre, n.

n. [Fr. hémisphère, Lat. hemi-sphærium, Gr. ἡμισφαίριον, from ἡμι, half, and σφαῖρα, sphere.]

1. A half sphere; one half of a sphere or globe, when divided by a plane passing through its center.
2. Half of the terrestrial globe, or a projection of the same in a map or picture.