A term introduced in or shortly before 1763 by the Swedish father of modern taxonomy Carl Linnaeus (also known as Carolus Linnaeus, and Carl von Linné, 1707-1778) to denote an order of the genus mentales (i.e. mental diseases) characterized by disturbances of the sensory faculties (i.e. "illusions and hallucinations).
References
Cullen, W. (1778). First lines of the practice of physic. Volume II. Edinburgh: William Creech.
Dictionary of Hallucinations. J.D. Blom. 2010.