gas main

noun
a large pipe for conducting and distributing gas to lesser pipes or ducts, especially such a pipe carrying and distributing household gas beneath the streets of a town or city.

Origin:
1810–20

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
gas main
 
n
a large pipeline in which gas is carried for distribution through smaller pipes to consumers

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
In order for natural gas to be available to you, there must be a gas main in your street.
When a gas main or service line is abandoned, it must be physically disconnected at both ends and the open ends must be sealed.
The gas company should be able to tell you how much it will cost to hook your house up to the gas main.
Whether or not natural gas service can be installed without cost depends on the proximity of an existing gas main.
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