dome

dome /ˈdoʊm/ noun
plural domes
dome
/ˈdoʊm/
noun
plural domes
Britannica Dictionary definition of DOME
[count]
1 
: a large rounded roof or ceiling that is shaped like half of a ball
2 
: a structure that looks like the dome of a building
3 
: a stadium that is covered by a roof
4 
informal : a person's head