Snift´ing
a. & n. | 1. | a. & n. from Snift.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. |
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Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.