Webster's Revised Unabridged Dictionary · 1913

Lunatic

Lunatic , adjective

[French lunatique, Latin lunaticus, from luna the moon. See Lunar.]

1.
Affected by lunacy; insane; mad; crazy; demented.
Lord, have mercy on my son; for he is lunatic. — Wyclif (Matt. xvii. 15)
2.
Of or pertaining to, or suitable for, an insane person; evincing lunacy; as, lunatic gibberish; a lunatic asylum.

Lunatic , noun

A person affected by lunacy; an insane person, esp. one who has lucid intervals; a madman; a person of unsound mind.
The lunatic, the lover, and the poet, Are of imagination all compact. — Shakespeare