Etymology
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aqualung (n.)

"portable air tanks and apparatus for breathing underwater," 1950, from aqua- + lung. Developed 1943 by Jacques Cousteau and Emile Gagnan.

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Definitions of aqualung

aqualung (n.)
a device (trade name Aqua-Lung) that lets divers breathe under water; scuba is an acronym for self-contained underwater breathing apparatus;
Synonyms: Aqua-Lung / scuba
From wordnet.princeton.edu