Lunatic is a term referring to a person who is seen as mentally ill, dangerous, foolish, or crazy—conditions once attributed to "lunacy". The word derives from lunaticus meaning "of the moon" or "moonstruck".
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History
The term "lunatic" derives from the Latin word lunaticus, which originally referred mainly to epilepsy and madness, as diseases thought to be caused by the moon. The King James Version of the Bible records "lunatick" in the Gospel of Matthew, which has been interpreted as a reference to epilepsy. By the fourth and fifth centuries, astrologers were commonly using the term to refer to neurological and psychiatric diseases. Pliny the Elder argued that the full moon induced individuals to lunacy and epilepsy by effects on the brain analogous to the nocturnal dew. Until at least 1700, it was also a common belief that the moon influenced fevers, rheumatism, episodes of epilepsy and other diseases.
Use of the term "lunatic" in legislation
In the jurisdiction of England and Wales, the Madhouses Act 1774 originated what later became Metropolitan Commissioners in Lunacy, under the Madhouses Act 1828. The Lunacy Acts 1890–1922 referred to "lunatics", but the Mental Treatment Act 1930 changed the legal term to "person of unsound mind", an expression which was replaced under the Mental Health Act 1959 by "mental illness". "Person of unsound mind" was the term used in 1950 in the English version of the European Convention on Human Rights as one of the types of person who could be deprived of liberty by a judicial process. The 1930 Act also replaced the term "asylum" with "mental hospital". Criminal lunatics became Broadmoor patients in 1948 under the National Health Service Act 1946.