Unnumbered source etymology
Original entry ↗noun
Selected source glosses provide context, not a complete modern definition inventoryAn air particulate filtration standard originating in the People's Republic of China, which requires filtration of 95% of air particulates that are 0.3 microns and larger. · Ellipsis of KN95 filter, a filter implementing the standard. · Ellipsis of KN95 mask, a face mask using a filter conforming to the standard.
Borrowed from Chinese KN95, from Mandarin 口罩 (Kǒuzhào) + English N95, from an initialism of Not resistant to oil particles with 95% filtration efficiency in NIOSH air filtration ratings.
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