Dictionary
buoy'ancy com"pensator
Scuba Diving.
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, buoy'ancy control' device". Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.