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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  • Aquamanile

    a medieval ewer, often made in grotesque animal forms. Ecclesiastical. a basin used by a celebrant for washing the hands during the saying of the Mass.

  • Aquanaut

    an undersea explorer, especially one who skin-dives from or lives for an extended period of time in a submerged dwelling. a skin-diver. noun a person who lives and works underwater a person who swims or dives underwater n. 1881, from aqua- + ending from Greek nautes “sailor” (see naval).

  • Aquaporin

    noun any one of a group of proteins in cell membranes that allow the passage of water across the membrane

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