: 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
Cite this Entry
“HEPA.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/HEPA. Accessed 13 Jul. 2025.
Copy CitationMedical Definition
HEPA
adjective
: 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
Etymology
high efficiency particulate air
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