■ noun
1》 a substance (typically, a corrosive or sour-tasting liquid) with particular chemical properties including turning litmus red, neutralizing alkalis, and dissolving some metals.
2》 Chemistry any molecule able to donate a proton or accept electrons in reactions.
3》 informal the drug LSD.
■ adjective
1》 containing or having the properties of an ~; having a pH of less than 7.
2》 sharp-tasting or sour.
3》 (of remarks) bitter or cutting.
4》 Geology & Metallurgy rich in silica.
Derivatives
~ification noun
~ify verb ( ~ifies , ~ifying , ~ified ).
~ly adverb
~y adjective
Origin
C17: from L. ~us , from acere 'be sour'.