buoyancy compensator

noun 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 CO₂ cartridge for rapid, emergency inflation.

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Also called BC, buoyancy control device.

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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Buoyancy compensator is always a great word to know.

So is flibbertigibbet. Does it mean:

a chattering or flighty, light-headed person.

a gadget; dingus; thingumbob.

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