acid >> /ˈæsəd/
Definition: [noun] A chemical substance that neutralizes alkalis, dissolves some metals, and turns litmus red; typically, a corrosive or sour-tasting liquid of this kind.
Example: traces of acid
Definition: [noun] A molecule or other entity that can donate a proton or accept an electron pair in reactions.
Example: They would like to use their carborane acids to bind protons to atoms of the inert gas xenon.
Definition: [noun] The drug LSD.
Definition: [adjective] Containing acid or having the properties of an acid; having a pH of less than 7.
Example: poor, acid soils
Definition: [adjective] Sharp-tasting or sour.
Example: acid fruit
Definition: [adjective] (of rock, especially lava) containing a relatively high proportion of silica.
Example: the magma may start off fairly basic and end up at the close of the eruption much more acid