Antonym: floor. Similar words: go off, room, troop, bedroom, bathroom, courtroom, mushroom, classroom. Meaning: [ruːf] 
n. 1. a protective covering that covers or forms the top of a building 2. protective covering on top of a motor vehicle. v. provide a building with a roof; cover a building with a roof.
n. 1. a protective covering that covers or forms the top of a building 2. protective covering on top of a motor vehicle. v. provide a building with a roof; cover a building with a roof. 
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241) I've had to chase the landlord up again to repair the roof.
242) Armstrong drove the ball into the roof of the net.
243) Mills have iron pillars all over the place holding up the roof.
244) The roof has been ingeniously designed to provide solar heating.
245) The roof was so low I could not stand upright.
246) We've got some swallows nesting in our roof at the moment.
247) The roof has a bad leak,and the rain is leaking in.
248) The shopping mall is covered over with an enormous glass roof.
249) Many house swallows perch themselves on the roof of the house.
250) One prisoner was still holding out on the roof of the jail.
251) We're good friends but we could never live under the same roof.
252) Pillars bolster the roof.
253) The tiny cottage with its leaded windows and thatched roof was as pretty as a picture.
254) Water tanks should be well lagged and the roof well insulated.
255) We could see the stars through an opening in the roof.
256) The water has penetrated into the bedroom,(http://sentencedict.com/roof.html) so there must be a hole in the roof.
257) The bedroom is in the roof so it's got a sloping ceiling.
258) Strapping the skis on the roof, we boarded the hovercraft in Dover.
259) They caved in the roof of the building with explosives.
260) Because of the slope of the roof, the snow cannot accumulate.
261) The heavy rain has penetrated the roof of my house.
262) A sniper hidden on a roof picked off three of the soldiers on patrol.
263) The main roof beams are given extra support by the smaller transverse beams.
264) Some prisoners climbed onto the roof and hung up a banner.
265) Overhead, the lights showed the old timbers, used to brace the roof.
266) If we're going to live under the same roof , we need to get along.
267) We slid down the roof and dropped to the ground.
268) We got two or three estimates before having the roof repaired.
269) The roof has an overhang to protect the walls from the rain.
270) Ten miners were trapped underground when the roof of the tunnel fell in.