from The Century Dictionary.

  • Of or pertaining to the valley of the Natron Lakes (Nitriæ), southwest of the delta of the Nile, at one time a chief seat of the worship of Serapis and afterward celebrated for its Christian monasteries and ascetics.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective mineralogy Describing minerals containing nitrogen (especially when this replaces another element)


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