ectoplasm

Etymology

ecto- + plasm

noun

1. (parapsychology) A visible substance believed to emanate from the body of a spiritualistic medium during communication with the dead.
   Watching as the woman lifted her skirts and flung out ectoplasm, expelled it into a bowl, then brandished it around at her audience wildly. 2021, Jenni Fagan, Luckenbooth, William Heinemann, page 131
2. (parapsychology) An immaterial or ethereal substance, especially the transparent corporeal presence of a spirit or ghost.
3. (cytology) The outer granule-free layer of cytoplasm.