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nox

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nox¹

Where it comes from

Learned borrowing from Latin nox, from Proto-Italic *nok⁽ʷ⁾ts, from Proto-Indo-European *nókʷts.

noun noctes · noxes · noces

  1. The period of darkness in each twenty-four hours; a night.

nox²

Where it comes from

From Latin nox (“night; darkness”), by analogy with lux from Latin lūx (“light; daylight, day”). Doublet of night.

noun nox

  1. rare millilux (unit of illuminance)

nox³

Where it comes from

From N (“nitrogen”) + ox (“oxide”).

noun

  1. alternative, uncountable Alternative form of NOx (nitrogen oxides)
  2. abbreviation, uncountable Abbreviation of nitrous oxide (“N₂O”). Near-synonym: nos

    Similar: nos

Nox⁴

Where it comes from

Borrowed from Latin Nox.

proper noun

  1. Roman The Roman goddess of night.

NOx⁵

  • /ɛn əʊ ˈɛks/

Where it comes from

From N (“nitrogen”) + O (“oxygen”) + x (“x substitution value”).

noun NOₓ

  1. Any of the various nitrogen oxides produced during combustion. "The NOx and particulate reductions provide clean air in the cities and communities we serve. [...]"

NOx⁶

  • /ɛn əʊ ˈɛks/

Where it comes from

From N (“nitrous”) + Ox (“oxygen”).

noun

  1. alternative, uncountable Alternative form of nox (“nitrous oxide”).

Translations

Every language

noun nitrogen oxides

한국어녹스 nokseu

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MLA

"nox." Wiktionary, via Micwyn, micwyn.com/word/nox. Accessed 6 Nov. 2026.

APA

nox. (n.d.). In Wiktionary, via Micwyn. Retrieved November 6, 2026, from https://micwyn.com/word/nox

Chicago

"nox." Wiktionary, via Micwyn. Accessed November 6, 2026. https://micwyn.com/word/nox.

BibTeX
@misc{nox_2026,
  title = {nox},
  howpublished = {Wiktionary, via Micwyn},
  year = {2026},
  url = {https://micwyn.com/word/nox},
  urldate = {2026-11-06}
}