a brand of underwater breathing apparatus for a swimmer or skin-diver, consisting of a cylinder of compressed air that is strapped to the back, a flexible tube connecting the cylinder with the swimmer’s mouth, and an automatic pressure regulator that controls the flow of air into the lungs.
Historical Examples

He was suddenly impatient to get going, to put on his aqualung and explore the reef from top to bottom.
The Wailing Octopus Harold Leland Goodwin

breathing apparatus used by divers, etc, consisting of a mouthpiece attached to air cylinders strapped to the back

1950, from aqua- + lung. Developed 1943 by Jacques Cousteau and Emile Gagnan.

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