Dictionary![]() ![]() a•cid•icPronunciation: (u-sid'ik), [key] —adj. 1. acid (def. 6). 2. Geol.acid (def. 9). 3. acid-forming (def. 1). 4. containing acid-bearing pollutants: Acidic runoff is poisoning the nation's rivers. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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