aqualung n 1: a device (trade name Aqua-Lung) that lets divers breathe under water; scuba is an acronym for self-contained underwater breathing apparatus [syn: {aqualung}, {Aqua- Lung}, {scuba}]
aqualung \aqualung\ n. an apparatus containing compressed air or other oxygen-gas mixture, permitting a person to breathe under water; -- also called a {scuba}. Syn: scuba [WordNet 1.5 +PJC]