ectoplasm

noun3

1. •
   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
2. •
   An immaterial or ethereal substance, especially the transparent corporeal presence of a spirit or ghost.

   • Then came some hollow groanings from inside the cabinet. The Spiritualists sat up expectantly. "That's ectoplasm," said Ogilvy. "It always causes pain on emission." — 1925
3. •
   The outer granule-free layer of cytoplasm.