[ak-wuh-luhng, ah-kwuh-]
Trademark. 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. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
aqualung (ˈækwəˌlʌŋ)
breathing apparatus used by divers, etc, consisting of a mouthpiece attached to air cylinders strapped to the back

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1950, from L. aqua "water" + lung. Developed 1943 by Jacques Cousteau and Emile Gagnan.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Aqualung may come up for so fresh air, with your help.
The hairs of its abdomen trap a silvery bubble of air so the spider can breathe as if it were wearing an aqualung.
Attracted to danger, he tried scuba diving, went spear fishing with an aqualung and loved drag racing.
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