Definition of "air-chamber" []

• A large cavity in an organic body containing air. (noun)
• A compartment of a hydraulic engine or apparatus, as a pump, interposed between and connected with the supply- and delivery-passages, and containing air which by its elasticity equalizes the pressure and flow of the fluids. (noun)
• Any compartment or chamber designed to contain air: as, the air-chamber of a life-boat. (noun)
• A septal chamber in the nautilus and other chambered cephalopods like the ammonites, goniatites, and orthoceratites. (noun)
• In botany: One of the mostly prismatic intercellular spaces occurring in aquatic plants. (noun)

The Century Dictionary (Public Domain)

• "Moreover, compared with even a torpedo boat, the airship was remarkably simple to construct, given the air-chamber material, the engines, the gas plant, and the design, it was reallt not more complicated and far easier than an ordinary wooden boat had been a hundred years before."
• "But he went up a ladder against a gale of ventilation — a ladder that was encased in a kind of gas-tight fire escape — and ran right athwart the great forward air-chamber to the little look-out gallery with a telephone, that gallery that bore the light pom-pom of German steel and its locker of shells."
• "The sleepers were steel, and their box-shape left an air-chamber which the gas expansion filled, to blow the middle of the sleeper upward."