petcock
noun
pet·cock ˈpet-ˌkäk 
: a small cock, faucet, or valve for releasing a gas (such as air) or draining
Word History
Etymology
pet- (perhaps from petty) + cock
First Known Use
circa 1864, in the meaning defined above
petcock
noun
as in valve
Synonyms & Similar Words
Relevance
- valve
- faucet
- cock
- stopcock
- spigot
- tap
- gate
- hydrant
- spout