Etymology
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hydrant (n.)

"apparatus for drawing water from a street main," 1806, from Greek hydr-, stem of hydor "water" (from suffixed form of PIE root *wed- (1) "water; wet") + -ant. OED double-damns it as "Irregularly formed" and "of U.S. origin."

updated on April 23, 2017

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Definitions of hydrant from WordNet

hydrant (n.)
a faucet for drawing water from a pipe or cask;
Synonyms: water faucet / water tap / tap
hydrant (n.)
a discharge pipe with a valve and spout at which water may be drawn from the mains of waterworks;
From wordnet.princeton.edu, not affiliated with etymonline.