- A compound yielding a hydrogen ion in a polar solvent (in water); acids form salts by replacing all or part of the ionizable hydrogen with an electropositive element or radical.
- Colloquially, any chemical compound that has a sour taste (given by the hydrogen ion).
- Sour; sharp to the taste.
- Relating to acid; giving an acid reaction. For individual acids not shown here, see specific names.
[L. acidus, sour]
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