Definition of aqualung noun from the Oxford Advanced Learner's Dictionary

 

aqualung

 noun
(also US English Aqualung™)noun
BrE BrE//ˈækwəlʌŋ//
 
; NAmE NAmE//ˈækwəlʌŋ//
 
Diving
 
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a piece of breathing equipment that a diver wears on his/her back when swimming underwater See related entries: Diving Word Origin 1950s (originally a proprietary name in the US): from Latin aqua ‘water’ + lung.
See the Oxford Advanced American Dictionary entry: aqualung