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  Dictionary Definition of acid

acid [1]
1. Chemistry a compound (usu. having a sour taste and capable of neutralising alkalis and reddening blue litmus paper) containing hydrogen which can be replaced by certain metals or an electropositive group to form a salt. Acids are proton donors, and yield hydronium ions in water solution.
2. a substance with a sour taste.
3. come the acid over, NZ Colloquial to act sharply or viciously towards.
4. put the acid on, Colloquial to ask (something) of (someone) in such a manner that refusal is difficult; pressure (someone): I'll tell every feller I know she's easy, and she won't be able to go down the street without having the acid put on her. -- RUTH PARK, 1949.
5. take the acid off, Colloquial to cease to pressure (someone).
-- adjective
6. Chemistry a. belonging or relating to acids or the anhydrides of acids. b. having only a part of the hydrogen of an acid replaced by a metal or its equivalent: an acid phosphate, etc.
7. tasting sharp or sour: Leila's mother said loquats might be acid for the baby. -- ELIZABETH JOLLEY, 1988.
8. sour; sharp; ill-tempered: And so on to a somewhat acid wrangle -- HENRY HANDEL RICHARDSON, 1925.
9. Geology (of igneous rocks) containing 66 per cent or more silica.
[L acidus sour]
-- acidly, adverb