What does "hydrant" mean?

An outlet from a liquid/fluid main often consisting of an upright pipe with a valve attached from which fluid (e.g. water or fuel) can be tapped.

Hydrant

Common synonyms include: acid, automatic sprinkler, carbon tet, carbon tetrachloride, carbon-dioxide foam, cock.

//ˈhaɪdɹənt// noun

noun ·Uncommon ·Advanced level

Noun

1
An outlet from a liquid/fluid main often consisting of an upright pipe with a valve attached from which fluid (e.g. water or fuel) can be tapped.
"A horde of dirty children play about the dripping hydrant, the only thing in the alley that thinks enough of its chance to make the most of it: it is the best it can do."
2
a discharge pipe with a valve and spout at which water may be drawn from the mains of waterworks wordnet
3
a faucet for drawing water from a pipe or cask wordnet