[hep-uh] /ˈhɛp ə/

noting or using an air filter composed of a mat of dense fibers arranged in folds, designed according to federal standards to trap at least 99.97% of airborne particles measuring 0.3 microns in diameter:
HEPA vacuums and air purifiers.
hamster egg penetration assay
high-efficiency particulate accumulator
high-efficiency particulate air
high-efficiency particulate arresting


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