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Definition of pet cock - 1 dictionary result

pet⋅cock

[pet-kok]
–noun
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:
1860–65; pet, perh. < F pet (see petard ) + cock 1
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Based on the Random House Dictionary, © Random House, Inc. 2009.
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