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NITRE

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Originally appearing in Volume V19, Page 711 of the 1911 Encyclopedia Britannica.
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NITRE , the name given to naturally occurring See also:

potassium nitrate; " cubic nitre " is See also:sodium nitrate. The word is adapted from See also:Lat. nitrum, which is itself adapted from Gr. virpov. These words were originally applied to the naturally occurring sodium carbonate; the connexion with potassium nitrate (sal petrae or sal petrosum) may be traced to Raimon See also:Lull's name sal nitri, which substance, however, he distinguished from nitrum. In the 16th See also:century the See also:ancient nitrum became altered to natron, a See also:term still used for native sodium carbonate, while nitrum, and its See also:adaptation nitre, were retained for potassium nitrate or See also:saltpetre (q.v.).

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