'Snifting valve' definitions:

Definition of 'Snifting valve'

From: GCIDE
  • Snifting \Snift"ing\, a. & n. from Snift. [1913 Webster]
  • Snifting valve, a small valve opening into the atmosphere from the cylinder or condenser of a steam engine, to allow the escape of air when the piston makes a stroke; -- so called from the noise made by its action. [1913 Webster]