Assertion: potassium nitrate | /r/CapableOf | derive its name
Facets:
value: from petre for stone
type: OTHER
value: from the greek sal for salt
type: OTHER
Source sentences:
text: Deriving its name from the Greek sal for salt and petre for stone, saltpetre was the scarcest of the three essential ingredients of gunpowder, along with charcoal and sulphur.