1. Adjective.  (chemistry) Having a pH less than 7, or being sour, or having the strength to neutralize alkalis, or turning a litmus paper red.
  2. Adjective.  (mineralogy) Containing a high percentage of silica; -- opposed to basic.
  3. Adjective.  Of or relating to acid; having the character of an acid.

This is an unmodified, but possibly outdated, definition from Wiktionary and used here under the Creative Commons license. Wiktionary is a great resource. If you like it too, please donate to Wikimedia.

This entry was last updated on RefTopia from its source on 3/20/2012.