roof·top

[roof-top, roof-]
noun
the roof of a building, especially the outer surface.

Origin:
1605–15; roof + top1

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
rooftop (ˈruːfˌtɒp) [Click for IPA pronunciation guide]
 
n
1.  the outside part of the roof of a building
2.  shout from the rooftops to proclaim (something) publicly

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Rooftop is always a great word to know.
So is lollapalooza. Does it mean:
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
American Heritage
Idioms & Phrases

rooftop

see shout from the rooftops.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
Thanks to photovoltaic technology, any sunny rooftop can be converted into a
  solar power generator.
The exhaust source locations include rooftop, grade level, and sources on
  adjacent buildings.
The regime cut off electricity and water and sent in tanks and rooftop snipers.
It means rooftop farming, so buildings don't simply displace arable land.
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