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nitrion

ˈnitrion Chem.
  [f. nitre n. + -ion1.]
  The supposed radical of nitric acid.

1868 Miller Elem. Chem., Inorg. (ed. 4) 95 The chlorine displaces the nitrion..from the argentic nitrate. Ibid. 96 Each atom of nitrion..requires one atom of a monad metal like potassium to neutralize it.

Oxford English Dictionary

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