Etymology
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saltpetre (n.)

chiefly British English spelling of saltpeter (q.v.); for ending, see -re.

updated on August 13, 2013

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Definitions of saltpetre from WordNet

saltpetre (n.)
(KNO3) used especially as a fertilizer and explosive;
Synonyms: potassium nitrate / saltpeter / niter / nitre
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.