Top Definition
A medical device - in the form of a a machine - used to treat Sleep Apnea, Lou Gerhig's Disease, and a few other conditions. It works by blowing pressurized air (not oxygen) into the notrils.

CPAP is an acronym for "Continuous Positive Air Pressure).
If you use a CPAP machine effectively, you will not snore.
by Anonymous August 25, 2003
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