Part of speech: adjective

Sharp to the taste, as vinegar; sour; of or like an acid.

Part of speech: noun

Any sour substance.

Part of speech: noun

A compound of hydrogen capable of uniting with a a bse to form a salt.

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Usage examples "acid":

  1. It is practically pure phenylacetic acid, m. - "Organic-Syntheses", Conant, James Bryant.
  2. A 10 per cent acid phosphate is low- grade. - "Crops and Methods for Soil Improvement", Alva Agee.
  3. You may call it a jolly little adventure, but I call it the acid test. - "The Prince of Graustark", George Barr McCutcheon.