dome

(architecture) A structural element resembling the hollow upper half of a sphere.

(by extension) Anything shaped like an upset bowl, often used as a cover.

(informal) A person's head.

(slang) head, oral sex

(obsolete, poetic) A building; a house; an edifice.

(by extension) Any erection resembling the dome or cupola of a building, such as the upper part of a furnace, the vertical steam chamber on the top of a boiler, etc.

(crystallography) A prism formed by planes parallel to a lateral axis which meet above in a horizontal edge, like the roof of a house; also, one of the planes of such a form.

(geology) A geological feature consisting of symmetrical anticlines that intersect where each one reaches its apex.