Definition of nitrum in US English:

nitrum

noun

  • Nitre; (specifically in early use) sodium carbonate (natron), washing soda (now historical). In later use: (Homeopathy) potassium nitrate (saltpetre).

Origin

Old English; earliest use found in Pseudo-Apuleius' Herbarium. From classical Latin nitrum nitre.

Pronunciation

nitrum

/ˈnʌɪtrəm/