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1. A standpipe or elevated tank used as a reservoir or for maintaining equal pressure in a water system.
2. A firefighting apparatus for lifting hoses to the upper levels of a tall structure.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Civil Engineering) a reservoir or storage tank mounted on a tower-like structure at the summit of an area of high ground in a place where the water pressure would otherwise be inadequate for distribution at a uniform pressure
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
1. a hollow vertical structure into which water is pumped high enough to maintain pressure required for firefighting, distribution, etc.
2. a fire-extinguishing apparatus for throwing a stream of water on the upper parts of a tall burning building.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.