air cock

noun

Machinery. a special type of valve for controlling the flow of air.

Origin of air cock

First recorded in 1790–1800

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for air cock

Historical Examples of air cock

There is also a valve or air-cock in the steam-chest, under the control of the engineer.
Illustrated Catalogue of Locomotives
M. Baird, et. al..
As soon as the water-valve was closed and the air-cock opened, the compressed air blew all of the water out of the tube.
Respiration Calorimeters for Studying the Respiratory Exchange and Energy Transformations of Man
Francis Gano Benedict