ppl. a. [f. ACIDIFY + -ING2.] Forming an acid; that combines so as to form an acid.

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1784.  Cavendish, in Phil. Trans., LXXIV. 152. Another thing which Mr. Lavoisier endeavours to prove is, that dephlogisticated air is the acidifying principle.

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1794.  G. Adams, Nat. & Exper. Phil., I. IX. 360. Called by M. Lavoisier the oxygenous or acidifying principle.

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1822.  Imison, Science & Art, II. 54. It has lately been discovered, that hydrogen, like oxygen, is an acidifying principle.

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1830.  Lindley, Nat. Syst. Bot., 84. Malic acid … is also almost the sole acidifying principle of the berries of the Mountain Ash.

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1851.  Richardson, Geol., v. 83. The erroneous idea of oxygen being the general acidifying principle.

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