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A small valve or faucet used to drain or reduce pressure, as from a boiler.
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.
(Mechanical Engineering) a small valve for checking the water level in a steam boiler or draining condensed steam from the cylinder of a steam engine
[C19: from pet1 or perhaps French pet, from péter to break wind + cock1]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a small valve or faucet, as for draining off excess or waste material from the cylinder of an internal-combustion engine.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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|Noun||1.||petcock - regulator consisting of a small cock or faucet or valve for letting out air or releasing compression or draining|
regulator - any of various controls or devices for regulating or controlling fluid flow, pressure, temperature, etc.
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.