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petcock

[pet-kok] /ˈpɛtˌkɒk/
noun
1.
a small valve or faucet, as for draining off excess or waste material from the cylinder of a steam engine or an internal-combustion engine.
Also, pet cock.
Origin
1860-1865
1860-65; pet, perhaps < French pet (see petard) + cock1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for petcock

petcock

/ˈpɛtˌkɒk/
noun
1.
a small valve for checking the water level in a steam boiler or draining condensed steam from the cylinder of a steam engine
Word Origin
C19: from pet1 or perhaps French pet, from péter to break wind + cock1
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for petcock
n.

also pet-cock, 1864, from cock (n.2); the signification of the first element is uncertain.

Online Etymology Dictionary, © 2010 Douglas Harper
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17
20
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