|any of various disorders in which a person's thoughts, emotions, or behaviour are so abnormal as to cause suffering to himself, herself, or other people|
|a chattering or flighty, light-headed person.|
|a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.|
mental disease n.
See mental illness.
mental illness n.
Any of various disorders characterized chiefly by abnormal behavior or an inability to function socially, including diseases of the mind and personality and certain diseases of the brain. Also called mental disease, mental disorder.
|mental illness (měn'tl) Pronunciation Key
Any of various psychiatric disorders or diseases, usually characterized by impairment of thought, mood, or behavior.