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acid
'acid' - used as an adjective
1. harsh or corrosive in tone
a barrage of acid comments
2. being sour to the taste
3. having the characteristics of an acid
an acid reaction

'acid' - used as a noun
4. any of various water-soluble compounds having a sour taste and capable of turning litmus red and reacting with a base to form a salt
5. street name for lysergic acid diethylamide
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Fact of the day
Every day the human stomach produces about 2 liters of hydrochloric acid.