BUOYANCY CONTROL DEVICE
buoyancy control device: translation
an expandable bladder in the form of an expandable vest used with scuba apparatus. It can be inflated with air from the scuba tank to increase buoyancy while diving and is used for resting, swimming or lending assistance to others under water. It is deflated by special air-dump valves or hoses. Also called a buoyancy compensator (BC). Abbreviated as BCD