N95
noun ·Rare ·Advanced level
Definitions
- 1 N95; Ellipsis of NIOSH N95.; The N95 standard. uncountable
"“One-way masking works,” Dr. Amesh Adalja, an infectious-disease specialist at Johns Hopkins University, said. When he is treating tuberculosis patients, they are typically maskless, and he wears an N95 mask to protect himself."
- 2 N95; Ellipsis of NIOSH N95.; An N95 filter. countable
"Unlike cloth masks, high-quality masks — called N95s, KN95s and KF94s — are made with layers of high-tech filtering material that trap at least 94 to 95 percent of the most risky particles."
Example
More examples"“One-way masking works,” Dr. Amesh Adalja, an infectious-disease specialist at Johns Hopkins University, said. When he is treating tuberculosis patients, they are typically maskless, and he wears an N95 mask to protect himself."
Etymology
Initialism of Not resistant to oil particles with 95% filtration efficiency in NIOSH air filtration ratings.
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.