NCI Dictionary of Cancer Terms
The NCI Dictionary of Cancer Terms features 8,119 terms related to cancer and medicine.
- listen (HY-per-ak-TIH-vih-tee)
- A higher than normal level of activity. Hyperactivity can be used to describe the increased action of a body function, such as hormone production, or behavior. A person who is hyperactive may seem to be always moving or fidgeting, impulsive, unable to concentrate, and talking too much.