WordReference Random House Unabridged Dictionary of American English © 2026
buoy′ancy com′pensator,  Scuba Diving.
  1. Sportan 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. Also called BC, buoy′ancy control′ device′. 

'buoyancy compensator' also found in these entries (note: many are not synonyms or translations):
BC

Forum discussions with the word(s) "buoyancy compensator" in the title:


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