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[pet-kok] /ˈpɛtˌkɒk/

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.
a small valve for checking the water level in a steam boiler or draining condensed steam from the cylinder of a steam engine

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


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