Webster's English Dictionary

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roof

1. roof \'ru:f, 'ru.f\ \'ru:fs, 'ru.fs also 'ru:vz, 'ru.vz\ \'ru:ft, 
   'ru.ft\ \'ru:-fl*s, 'ru.f-l*s\ \'ru:-.fli-k, 'ru.f-.li-k\ n or roofs [ME, 
   fr. OE hro-f; akin to ON hro-f roof of a boathouse, OSla] pl v 
   stropuhachek> roof 1a: the cover of a building  1b: DWELLING, HOME  1c: 
   ROOFING {slag or gravel ~} {coal tar, pitch, and felt  ~} 2a1: the highest 
   point : SUMMIT  2a2: CEILING  2b: something resembling a roof in form or 
   function  3a: the vaulted upper boundary of the mouth  3b: a covering 
   structure of any of various parts of the body  - roofed aj
2. roof vt 1a: to cover with or as if with a roof  1b: to provide (a roof) 
   with a protective exterior  2: to constitute a roof over  - roof.er n