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Meaning of buoyancy compensator

buoy'ancy com"pensator

Pronunciation: [key]
— 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 cartridge for rapid, emergency inflation. Also called
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.