aqualung

Other forms: aqualungs

If your life's ambition is to live underwater like a mermaid, you'd better get practicing on how to use an aqualung, an underwater breathing system.

An aqualung is a kind of diving equipment that lets you breathe under water. It's an air tank strapped to your back plus a mouthpiece that lets you breathe in that air. Its name was the brand name of the first ever underwater breathing apparatus, what we now call scuba equipment. There have been lots of developments in scuba diving since then, but many of them are based on the aqualung.

Definitions of aqualung

1. noun

   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

   type of:

   breathing apparatus, breathing device, breathing machine, ventilator

   a device that facilitates breathing in cases of respiratory failure