Having a sour or sharp taste or smell. The lemon juice was too acidic for my taste.
Containing acid or having the properties of an acid. The soil in this region is quite acidic, which affects the types of plants that can grow here.
Harsh or biting in tone or manner. Her acidic remarks during the meeting left everyone feeling uncomfortable.
(Chemistry) Having a pH value of less than 7; tending to increase the concentration of hydrogen ions when dissolved in water. Rainwater can become acidic when it absorbs pollutants such as sulfur dioxide, lowering its pH below 7.