HEPA
adjective
ˈhe-pə 
: being, using, or containing a filter usually designed to remove 99.97 percent of airborne particles measuring 0.3 micrometers or greater in diameter passing through it
Word History
Etymology
high-efficiency particulate air (filter)
First Known Use
1965, in the meaning defined above
Medical Definition
HEPA
adjective
ˈhep-ə
: being, using, or containing a filter usually designed to remove 99.97% of airborne particles measuring 0.3 microns or greater in diameter passing through it
HEPA filters
HEPA vacuum cleaners