adj ·Moderate ·College level

Definitions

Adjective

1. 1
   Having a pH less than 7, or being sour, or having the strength to neutralize alkalis, or turning a litmus paper red.

   "The swampland is an extensive pegasse swamp, which is rich in organic matter and intensely acidic."

2. 2
   Containing a high percentage of silica-bearing minerals; opposed to basic.
3. 3
   Of or relating to acid; having the character of an acid.

   "an acidic solution"

Adjective

1. 1
   being or containing an acid; of a solution having an excess of hydrogen atoms (having a pH of less than 7) wordnet
2. 2
   being sour to the taste wordnet

Synonyms

All synonyms

acidcausticacerbicacidacidacid forming

Antonyms

All antonyms

basicmaficalkalineamphoteric

Example

More examples

"Lemons and limes are acidic fruits."

Etymology

From acid + -ic. Doublet of acidy.

Related phrases

glial fibrillary acidic proteinlitmus paper

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.