10 letters · 20 points in Scrabble
noun half of the terrestrial globe
noun half of a sphere
noun either half of the cerebrum
originFrom Latin hemisphaerium, from Ancient Greek ἡμισφαίριον (hēmisphaírion), from ἡμι- (hēmi-, “half”) + σφαῖρα (sphaîra, “sphere”). Equivalent to hemi- + sphere. Displaced native Old English healftrendel (literally “half-sphere”).
Etymology from Wiktionary, CC BY-SA 3.0