[ˈasɪd], (Noun)

Definitions:
- a substance with particular chemical properties including turning litmus red, neutralizing alkalis, and dissolving some metals; typically, a corrosive or sour-tasting liquid of this kind
(e.g: trees were exposed to mixtures of heavy metals, acids, and overdoses of nutrients)

- a molecule or other species which can donate a proton or accept an electron pair in reactions

- the drug LSD
(e.g: she didn't have a clue the sweet had acid in it)


Phrases:
- put the acid on

Origin:
early 17th century (in the sense ‘sour-tasting’): from Latin acidus, from acere ‘be sour’

[ˈasɪd], (Adjective)

Definitions:
- containing acid or having the properties of an acid; having a pH of less than 7
(e.g: acid soils)

- sharp-tasting or sour
(e.g: acid fruit)

- (of rock, especially lava) containing a relatively high proportion of silica
(e.g: the magma may start off fairly basic and end up at the close of the eruption much more acid)


Phrases:
- put the acid on

Origin:
early 17th century (in the sense ‘sour-tasting’): from Latin acidus, from acere ‘be sour’