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Meaning of diacid

di•ac•id

Pronunciation: (dī-as'id), [key]
— adj. Chem.
  1. capable of combining with two molecules of a monobasic acid.
  2. (of an acid or a salt) having two replaceable hydrogen atoms.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.