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Definition of acidic
1having the properties of an acid, or containing acid; having a pH below 7. Often contrasted with alkaline or basic. Geology (of rock, especially lava) relatively rich in silica. Metallurgy relating to or denoting steelmaking processes involving silica-rich refractories and slags. 2sharp-tasting or sour:acidic wine (of a person’s remarks or tone) bitter or cutting:the occasional acidic comment (of a color) intense or bright:an acidic yellow 3of or relating to acid rock or acid house music.