Dome
DOME, noun [Gr., a house, a plain roof. Latin ]
1. A building; a house; a fabric; used in poetry.
2. A cathedral.
3. In architecture, a spherical roof, raised over the middle of a building; a cupola.
4. In chemistry, the upper part of a furnace, resembling a hollow hemisphere or small dome This form serves to reflect or reverberate a part of the flame; hence these furnaces are called reverberating furnaces.