of the nature of or resembling acid; sharp; sour: an acidy taste.

acid + -y1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
acid (ˈæsɪd)
1.  See also Lewis acid any substance that dissociates in water to yield a sour corrosive solution containing hydrogen ions, having a pH of less than 7, and turning litmus red
2.  a sour-tasting substance
3.  a slang name for LSD
4.  chem
 a.  of, derived from, or containing acid: an acid radical
 b.  being or having the properties of an acid: sodium bicarbonate is an acid salt
5.  sharp or sour in taste
6.  cutting, sharp, or hurtful in speech, manner, etc; vitriolic; caustic
7.  (of rain, snow, etc) containing pollutant acids in solution
8.  (of igneous rocks) having a silica content of more than 60% of the total and containing at least one tenth quartz
9.  metallurgy of or made by a process in which the furnace or converter is lined with an acid material: acid steel
[C17: (first used by Francis Bacon): from French acide or Latin acidus, from acēre to be sour or sharp]

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Example sentences
In addition, staff tested the acidy of waters in the mine area with a portable pH meter.
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