NCI Dictionary of Cancer Terms
The NCI Dictionary of Cancer Terms features 7,990 terms related to cancer and medicine.
- listen (a-SIH-dih-tee)
- Describes the amount of acid in a substance. An acid is a chemical that gives off hydrogen ions in water and forms salts by combining with certain metals. Acidity is measured on a scale called the pH scale. On this scale, a pH value of 7 is neutral, and a pH value of less than 7 to 0 shows increasing acidity.