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Search Result for "petcock": 
Wordnet 3.0

NOUN (1)

1. regulator consisting of a small cock or faucet or valve for letting out air or releasing compression or draining;


The Collaborative International Dictionary of English v.0.48:

pet \pet\, a. Petted; indulged; favorite; admired; cherished; as, a pet child; a pet lamb; a pet theory; a pet animal. [1913 Webster] Some young lady's pet curate. --F. Harrison. [1913 Webster] Pet cock. [Perh. for petty cock.] (Mach.) A little faucet in a water pipe or pump, to let air out, or at the end of a steam cylinder, to drain it. [Also spelled petcock.] [1913 Webster]
The Collaborative International Dictionary of English v.0.48:

petcock \pet"cock`\ (p[e^]t"k[o^]k`) n. A small cock or faucet or valve for letting out air or releasing compression, or for draining a vessel. [WordNet 1.5]
WordNet (r) 3.0 (2006):

petcock n 1: regulator consisting of a small cock or faucet or valve for letting out air or releasing compression or draining