Definition of "ectoplasmic"

"In this case being unable, owing to the evil conditions which you have yourself created, to build up an ectoplasmic form they wrapped the unconscious medium in an ectoplasmic covering, and sent him forth from the cabinet."

1925 July – 1926 May, A[rthur] Conan Doyle, “(please specify the chapter number)”, in The Land of Mist (eBook no. 0601351h.html), Australia: Project Gutenberg Australia, published April 2019

Kathleen wore dungarees and her gingham skirt was laundered to an ectoplasmic degree.

1976 September, Saul Bellow, Humboldt’s Gift, New York, N.Y.: Avon Books, page 232