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metagallic

metagallic, a. Chem.
  (mɛtəˈgælɪk)
  [f. meta- + gallic a.2]
  metagallic acid: an acid obtained by heating gallic acid. Hence metaˈgallate, a salt of metagallic acid.

1835 Amer. Jrnl. Sci. XXVIII. 126 Metagallic acid. 1836 Brande Chem. (ed. 4) 933. Ibid., Metagallate of potassa. 1865 Watts tr. Gmelin's Handbk. Chem. XV. 458 Metagallic acid (Mulder's melangallic, Gerhardt's gallulmic acid).

Oxford English Dictionary

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