Hi Mark,
the hydrant (by the meaning of the word) is something connected
to the water main ;)
If I read the previous wikipedia link, there are pressurized hydrant
and
not-pressurized hydrant.
If wikipedia use the word hydrant for both, maybe the "by the meaning
of
the world" is that.
I would rely on the Collins English Dictionary in this point rather then
on wikipedia [1]
(General Engineering) 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. See also fire hydrant
According to this definition a dry hydrant is not a hydrant because of
the lack of connection to the water main.
Regards
Moritz
[1]: http://www.thefreedictionary.com/hydrant
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