depression medical definition

noun

The act of depressing or the state of being depressed.
A reduction in physiological vigor or activity.
A lowering in amount, degree, or position.
An inward displacement of a body part.
A hollow or sunken area.
The condition of feeling sad or despondent.
A psychiatric disorder characterized by an inability to concentrate, insomnia, loss of appetite, anhedonia, feelings of extreme sadness, guilt, helplessness and hopelessness, and thoughts of death. Also called clinical depression.

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