N99

noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    N99; Ellipsis of NIOSH N99.; N99 standard uncountable
  2. 2
    N99; Ellipsis of NIOSH N99.; N99 filter countable

Etymology

From Initialism of Not resistant to oil particles with 99% 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.