(Roman mythology) The Roman goddess of night.

(rare) millilux (unit of illuminance)

Alternative form of NOx (nitrogen oxides) / Abbreviation of nitrous oxide.

(chemistry) Any of the various nitrogen oxides produced during combustion.

(automotive performance) Alternative form of nox

(historical) Any profession that was disreputable because it caused a great deal of pollution. The archetypal example is the tannery.

Harmful; injurious.

In a noxious manner.

plural of noxa

(medicine) Anything that exerts a harmful influence, such as trauma, poison, etc.