acid ( def 5 ).
Geology, acid ( def 8 ).
acid-forming ( def 1 ).
containing acid-bearing pollutants: Acidic runoff is poisoning the nation's rivers.

1875–80; acid + -ic

nonacidic, adjective
semiacidic, adjective
unacidic, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
acidic (əˈsɪdɪk)
1.  another word for acid
2.  (of an oxide) yielding an acid in aqueous solution

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
acid   (ās'ĭd)  Pronunciation Key 
Any of a class of compounds that form hydrogen ions when dissolved in water, and whose aqueous solutions react with bases and certain metals to form salts. Acids turn blue litmus paper red and have a pH of less than 7. Their aqueous solutions have a sour taste. Compare base.

acidic adjective
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Once cleared, the acidic dirt of the forest floor is exhausted after a few harvests.
Acidic paper degrades faster, by a process known as slow fires.
Is an acidic oxide an aqueous solution turns litmus from blue to pink.
They are found in acidic bogs throughout the cooler parts of the northern hemisphere.
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