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.

plural of hydrant

plural of fire hydrant

(firefighting) A device used by firefighters to obtain water from the main supply, consisting of a barrel, connections for hose and a valve assembly.

(zoology) An individual polyp of a hydroid colony

plural of hydranth