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adjective Chemistry.
  1. capable of combining with two molecules of a monobasic acid.
  2. (of an acid or a salt) having two replaceable hydrogen atoms.
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Origin of diacid

First recorded in 1865–70; di-1 + acid
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for diacid


  1. another word for diacidic
  2. (of a salt or acid) containing two acidic hydrogen atomsNaH 2 PO 4 is a diacid salt of phosphoric acid
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  1. an acid or salt that contains two acidic hydrogen atoms
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012