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buoyancy compensator

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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 CO2 cartridge for rapid, emergency inflation.
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Also called BC, buoyancy control device.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018