dome vs mansard roof

dome

noun
  • 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. 

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

  • A person's head. 

  • head, oral sex 

  • A structural element resembling the hollow upper half of a sphere. 

  • 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. 

  • Anything shaped like an upset bowl, often used as a cover. 

verb
  • To shoot in the head. 

  • To give a domed shape to. 

  • To perform fellatio on. 

mansard roof

noun
  • A steeper roof that terminates into a flat roof at its high point. 

  • A roof having two slopes on each side, the lower one having a steeper pitch than the upper; this increases the volume of the enclosed space. 

How often have the words dome and mansard roof occurred in a corpus of books? (source: Google Ngram Viewer )