Meanings
nox1
plural noctes · plural proscribed noxes · plural proscribed noces
- The period of darkness in each twenty-four hours; a night.
nox2
- raremillilux (unit of illuminance)
nox3
- alternativeuncountableAlternative form of NOx (nitrogen oxides)
Nox4
NOx5
- chemistryAny of the various nitrogen oxides produced during combustion.
"The NOx and particulate reductions provide clean air in the cities and communities we serve. [...]"
2020 December 16, Daniel Puddicombe, “Treated DMUs become greener and cleaner”, in Rail, page 46
NOx6
- alternativeuncountableautomotive performanceAlternative form of nox (“nitrous oxide”).
Synonyms & antonyms
Origin
nox · noun
- Proto-Indo-European*nókʷts
- Proto-Italic*nok⁽ʷ⁾ts
- Latinnox
- Englishnox
Learned borrowing from Latin nox, from Proto-Italic *nok⁽ʷ⁾ts, from Proto-Indo-European *nókʷts.
More words from Latin
Full word history & related roots →nox · noun
- Latinnox“night; darkness”
- Englishnox
From Latin nox (“night; darkness”), by analogy with lux from Latin lūx (“light; daylight, day”). Doublet of night.
More words from Latin
Full word history & related roots →Nox · proper noun
- LatinNox
- LatinNox
- EnglishNox
Borrowed from Latin Nox.
More words from Latin
Full word history & related roots →NOx · noun
From N (“nitrogen”) + O (“oxygen”) + x (“x substitution value”).
Full word history & related roots →Translations
Hungarian nitrózus gázok, nitrózus gáz
- nitrózus gázoknitrogen oxides
- nitrózus gáznitrogen oxides
Korean 녹스
- 녹스 (nokseu)nitrogen oxides
Rhymes & wordplay
Anagrams
Cite this entry
nox. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/nox
“nox.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/nox. Accessed November 2, 2026.
WatkinsX Dictionary, s.v. “nox,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/nox.
Source: nox on Wiktionary, CC BY-SA 4.0.