Definition: Coined by Charles Richet and popularized in the movie the Ghost Busters, ectoplasms are often described as gooey masses that may accumulate because of the presence of ghosts.

Aliases: Ghost matter

Slimer from Ghostbusters, said to be made from ectoplasm.

Most ghosts have been described as metaphysical, having no connection with the real world. They can make a breeze or other metaphysical activities, yet they have no real affect on the world. But other spirits can incarnate themselves into to the physical world, or leave waste from their presence. It is often very gooey, not unlike rubber cement. Its color can vary, but it is most often green or yellow. It has been found in several places mysteriously, from barns to houses and to wooded areas.