(originally) Potassium nitrate. / (uncommon) Sodium nitrate.

(transitive) To treat with saltpetre.

(obsolete) Of or pertaining to saltpetre.

plural of saltpetre

Third-person singular simple present indicative form of saltpetre

present participle of saltpetre

simple past tense and past participle of saltpetre

(mineralogy) A form of sodium nitrate that occurs naturally in parts of Chile and Peru.

calcium nitrate