In spiritualism, ectoplasm, also known as simply ecto, is a substance or spiritual energy "exteriorized" by physical mediums. It was coined in 1894 by psychical researcher Charles Richet.[1] Although the term is widespread in popular culture,[2] there is no scientific evidence that ectoplasm exists[3][4][5][6] and many purported examples were exposed as hoaxes fashioned from cheesecloth, gauze or other natural substances.[7][8]
The term comes from the Ancient Greek words ἐκτός ektos, "outside" and πλάσμα plasma, "anything formed".
^Blom, Jan Dirk. (2010). A Dictionary of Hallucinations. Springer. p. 168. ISBN978-1-4419-1222-0
^Stein, Gordon (1993). Encyclopedia of Hoaxes. Farmington Hills, Michigan: Gale Group. p. 205. ISBN0-8103-8414-0. One strange phenomena of spiritualism, once popular, was the production of ectoplasm. This was a white substance that appeared to ooze from various openings of the medium's body. It was usually made of gauze, chiffon, or cheesecloth, often soaked or treated with various substances.