water main

noun
a main pipe or conduit in a system for conveying water.

Origin:
1795–1805

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
water main
 
n
a principal supply pipe in an arrangement of pipes for distributing water

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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Example sentences
Likewise, if the lights in your house don't work you don't check the water main.
Three pipes, each about the size of a water main, emerge from the containment
  building wall.
Then reporters, trying to get a better view of the pond, twice broke a water
  main.
Such programs include water main and hydrant repairs and installations.
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