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Definition of aqualung

aqualung

/ˈæk.wə.lʌŋ/
aq · ua · lung
Plural:aqualungs
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aqualung Lexical Profile

aqualung Game Scores & Validity

• noun

1

A portable underwater breathing apparatus consisting of cylinders of compressed air strapped to the diver's back and connected to a demand regulator and mouthpiece.

Example

"The marine biologist strapped on her aqualung before descending to inspect the coral reef."

Synonyms
View all synonyms for aqualung

Word Nuance & Usage

Originally a proprietary trademark (Aqua-Lung), the term is frequently used generically in lowercase, especially in British English, to refer to any open-circuit scuba apparatus.

• Nearby Words

aquaculture
aquaerobics
aquafarming
aqualung
aquamarine
aquaphobic
aquarian

Word Origin & Etymology

Coined in the 1940s from the Latin 'aqua' (water) and the English word 'lung', originally introduced as the trade name for the underwater breathing apparatus co-invented by Jacques-Yves Cousteau and Émile Gagnan in 1943.

Usage Trend

Historical frequency of usage in published text.

180019102020
Data source: Google Books Ngram Viewer

Cite this Entry

Wordmom. (2026). Definition of Aqualung. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/aqualung
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