an upright pipe with a spout, nozzle, or other outlet, usually in the street, for drawing water from a main or service pipe, especially for fighting fires.
a water faucet.

1800–10, Americanism; hydr-1 + -ant

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World English Dictionary
hydrant (ˈhaɪdrənt)
See also fire hydrant an outlet from a water main, usually consisting of an upright pipe with a valve attached, from which water can be tapped for fighting fires
[C19: from hydro- + -ant]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1806, coined in Amer.Eng. from Gk. hydr-, stem of hydor "water" (see water (n.1)) + -ant, prp. ending of L. verbs.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Toilets were installed, using water drawn from a fire hydrant.
Water from a fire hydrant will slick the vinyl track.
Imagine an aerial photograph of the whole city that is so detailed it can
  capture something as tiny as a fire hydrant.
The fire hydrant of the future will have a new mission in addition to fighting
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