Dictionary.com
definitions

HEPA

[hep-uh]
adjective
  1. 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.

Origin of HEPA

H(igh-)E(fficiency) P(articulate) A(ir)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for hepa

Historical Examples of hepa