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soda niter

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noun
  1. a white or transparent mineral, sodium nitrate, NaNO3, used chiefly as a fertilizer and in the manufacture of sulfuric and nitric acids and potassium nitrate.

Origin of soda niter

First recorded in 1895–1900
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018