petcock

Definition

A small valve, spout, or faucet operated by hand, usually used to release pressure or drain fluid.

Etymology

Apparently from pet + cock, because of its size.

Example Sentences

• "The doctor placed the rubber mask over her face and turned a dial and I watched Catherine breathing deeply and rapidly. Then she pushed the mask away. The doctor shut off the petcock."
• "The shutoff valve (petcock) is usually located on the gas pipe on the supply side of the meter."