noun
nox
ehn-oh-EHKS
noun
1
Any of several nitrogen oxide gases produced by burning fuel, a major source of air pollution.
"Diesel engines are notorious for high NOx emissions."
How to Use Nox
Learner’s notesIn plain EnglishA pollutant gas linked to vehicle exhaust and smog.
Common pairings
NOx emissions
NOx levels
Word Forms
noctes plural, noxes plural, noces plural, nox plural
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Diesel engines are notorious for high _____ emissions.
Etymology
From Latin nox, "night" — the chemical sense (NOx) is unrelated and comes from combining "nitrogen" and "oxide."