Ectoplasm : is a strange, visible, semi-fluid substance, that
is believed to emanate from the body of a physical medium/spiritualistic
medium. The ectoplasm may or may not go on to form materialisations.
The phenomenon usually occurs while mediums are either in
communication with the dead or in a trance.
In relation to the transparent corporeal presence of a spirit
or ghost, ectoplasm is the immaterial or ethereal substance
defining its shape.