noun. (KNO3) used especially as a fertilizer and explosive.
1. Noun, singular or mass Beet juice can substitute for saltpetre as a means to cure meat in a chemically free way. 2. Verb, base form As an alternative to saltpetre, the natural nitrates in sea salt can change to nitrites when they encounter certain bacteria, replicating the characteristics of traditionally cured meats, according to the American Meat Institute.