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buoyancy compensator

noun, Scuba Diving.
1.
an inflatable vest used to control one's buoyancy underwater or to rest at the surface, usually having a connecting hose for inflation or deflation by mouth and a CO 2 cartridge for rapid, emergency inflation.
Also called BC, buoyancy control device.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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  • The buoyancy compensator seal ring could crack, posing a drowning hazard to divers.

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