|depression (dĭ-prěsh'ən) Pronunciation Key
A geographic area, such as a sinkhole or basin, that is lower than its surroundings.
A mood disorder characterized by an inability to experience pleasure, difficulty in concentrating, disturbance of sleep and appetite, and feelings of sadness, guilt, and helplessness.
A reduction in the activity of a physiological process, such as respiration.
A region of low atmospheric pressure. Low pressure systems result in precipitation, ranging from mild to severe in intensity. See also cyclone.