acidic >> əˈsɪdɪk
Definition: [adjective] having the properties of an acid, or containing acid; having a pH below 7.
Example: a cocktail of acidic pollutants
Definition: [adjective] sharp-tasting or sour.
Example: acidic wine
Definition: [adjective] (of rock, especially lava) relatively rich in silica.
Example: acidic granite batholiths