acidic

adjective ! Definition from Wiktionary (CC BY-SA). Pronunciation from Wiktionary, via Kaikki.org. More about acidic at Wordnik → Where our words come from →

1. Of or relating to acid; having the character of an acid.

   an acidic solution

2. Having a pH less than 7, or being sour, or having the strength to neutralize alkalis, or turning a litmus paper red.
3. Containing a high percentage of silica-bearing minerals.