hemi·sphere 
/ˈhɛməˌsfiɚ/ noun
plural hemi·spheres /ˈhɛməˌsfiɚ/ noun [count] 1 : a half of the Earth
▪ the Northern/Southern Hemisphere [=the half of the Earth that is north/south of the equator] ▪ the Eastern Hemisphere [=the half of the Earth that is east of the Atlantic Ocean and that includes Europe, Africa, Asia, and Australia] ▪ the Western Hemisphere [=the half of the Earth that is west of the Atlantic Ocean and that includes North and South America] 2 : half of a sphere : half of a round object 3 technical : either of the two halves of the brain
▪ a tumor in the right/left cerebral hemisphere
▪ the Northern/Southern Hemisphere [=the half of the Earth that is north/south of the equator] ▪ the Eastern Hemisphere [=the half of the Earth that is east of the Atlantic Ocean and that includes Europe, Africa, Asia, and Australia] ▪ the Western Hemisphere [=the half of the Earth that is west of the Atlantic Ocean and that includes North and South America]
▪ a tumor in the right/left cerebral hemisphere
— hemi·spher·ic /ˌhɛməˈsfirɪk/ or hemi·spher·i·cal /ˌhɛməˈsferɪkəl/ adjective, technical
▪ a hemispherical structure
/ˌhɛməˈsfirɪk/ or hemi·spher·i·cal /ˌhɛməˈsferɪkəl/ adjective, technical ▪ a hemispherical structure
