Nox
name, noun ·Uncommon ·Advanced level
Definitions
- 1 The period of darkness in each twenty-four hours; a night.
- 2 millilux (unit of illuminance) rare
- 3 Alternative form of NOx (nitrogen oxides) alt-of, alternative, uncountable
- 4 Any of the various nitrogen oxides produced during combustion.
""The NOx and particulate reductions provide clean air in the cities and communities we serve. [...]""
- 5 Alternative form of nox (“nitrous oxide”). alt-of, alternative, uncountable
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- 6 Abbreviation of nitrous oxide (“N₂O”). abbreviation, alt-of, uncountable
"Near-synonym: nos"
- 1 The Roman goddess of night. Roman
Example
More examples""The NOx and particulate reductions provide clean air in the cities and communities we serve. [...]""
Etymology
Etymology tree Proto-Indo-European *nókʷts Proto-Italic *nokts Latin noxlbor. English nox Learned borrowing from Latin nox, from Proto-Italic *nokts, from Proto-Indo-European *nókʷts.
From Latin nox (“night; darkness”), by analogy with lux from Latin lūx (“light; daylight, day”). Doublet of night.
From N (“nitrogen”) + ox (“oxide”).
From Latin Nox.
From N (“nitrogen”) + O (“oxygen”) + x (“x substitution value”).
From N (“nitrous”) + Ox (“oxygen”).
Related phrases
More for "nox"
Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.