Webster's English Dictionary

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dome

1. dome \'do-m\ n [F, It, & L; F do^me dome, cathedral, fr. It duomo 
   cathedral, fr.]ML domus church, fr. L, house - more at TIMBER archaic  1: a 
   stately building : MANSION  2: a large hemispherical roof or ceiling  3: a 
   natural formation or other structure that resembles the dome or cupola  of 
   a building 4a: a form of crystal composed of planes parallel to a lateral 
   axis which m eet above in a horizontal edge like a roof 4b: a form of 
   crystal composed of only two faces intersecting along and ast ride of a 
   symmetry plane
2. dome vt 1: to cover with or as if with a dome  2: to form into a dome  : 
   to swell upward or outward like a dome