saltpeter

Noun
  1. (KNO3) used especially as a fertilizer and explosive (synset 114885506)
    is a type of: nitrate - any compound containing the nitrate group (such as a salt or ester of nitric acid)
    substance meronym: fertiliser, fertilizer, plant food - any substance such as manure or a mixture of nitrates used to make soil more fertile
    same as: niter, nitre, potassium nitrate, saltpetre

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