GNU Webster's 1913
- n. a valve to regulate the admission or egress of air; esp. a valve which opens inwardly in a steam boiler and allows air to enter.
- n. etc. See under Air. Ball, Check, etc.
“The air cells may all be represented as soft-walled bags opening freely into the bellows ” there being, so far as anatomists yet know, no valves or corresponding contrivances anywhere except at the glottis, which corresponds with the nozzle and air valve both, of our bellows.”
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