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perchloric

perchloric, a. Chem.
  (pəˈklɔərɪk)
  [f. per-1 5 b + chloric.]
  In perchloric acid, hydrogen perchlorate, HClO4, the oxygen acid of chlorine containing more oxygen than chloric acid (HClO3).

1818 W. Henry Elem. Chem. (ed. 8) I. 437 The per-chloric acid will then consist of one atom of chlorine = 33·5, united with seven atoms of oxygen = 52·5. 1856 Miller Elem. Chem. II. 536. 1869 Roscoe Elem. Chem. (1871) 115 Perchloric acid is one of the most powerful oxidizing agents known.

Oxford English Dictionary

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