fireplug

[Joanne M. Despres]

I never heard "fireplug" where I grew up (north of Boston).  I haven't
heard it in western MA, either, but can't recall any specific instance
of a local person referring to the thing.  My gut feeling is that it's
probably "fire hydrant" out here, though, too.
Joanne M. Despres, Senior Editor
Merriam-Webster, Inc.
jdespres at merriam-webster.com
http://www.merriam-webster.com