Etymology
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petcock (n.)

also pet-cock, "a small plug-cock, made to be fastened to a pipe and used for draining water and condensation from steam cylinders, etc.," 1864, from cock (n.2); the signification of the first element is uncertain.

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Definitions of petcock

petcock (n.)
regulator consisting of a small cock or faucet or valve for letting out air or releasing compression or draining;
From wordnet.princeton.edu

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peter