Étienne Félix d'Henin de Cuvillers
Etienne Félix d'Henin de Cuvillers (1755-1841) was a French "magnetist" who was an early practitioner of mesmerism as a scientific discipline.
Hénin de Cuvillers was a follower of Franz Anton Mesmer (1734-1815). However, unlike Mesmer he did not believe in the existence of a "magnetic fluid" in animal magnetism, and instead emphasized the role of mental processes in mesmerism. In his book Le magnétisme éclairé, he describes accounts of mesmeric effects in terms of belief and suggestibility.
He is credited for popularizing a system of scientific nomenclature by using the prefix "hypn" in words such as hypnotique (hypnotic), hypnotisme (hypnotism) and hypnotiste (hypnotist). He used these terms as early as 1820, and is believed by many to have coined these names. In 1819 he became editor of the Archives du Magnetisme Animal.