P99

noun

P99 standard

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Meanings

nounP99 (countable and uncountable, plural P99s)

plural P99s

  1. P99; Ellipsis of NIOSH P99.
    1. uncountableP99 standard
    2. countableP99 filter

Origin

From Initialism of oil-Proof with 99% filtration efficiency in NIOSH air filtration ratings.

Full word history & related roots →
Cite this entry
APA

P99. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/P99

MLA

“P99.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/P99. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “P99,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/P99.

Source: P99 on Wiktionary, CC BY-SA 4.0.