The Collaborative International Dictionary of English v.0.48:

Ectoplasm \Ec"to*plasm\, n. [Ecto- + Gr. ? form.] (Biol.)
   (a) The outer transparent layer of protoplasm in a developing
       ovum.
   (b) The outer hyaline layer of protoplasm in a vegetable
       cell.
   (c) The ectosarc of protozoan.
       [1913 Webster]

WordNet (r) 3.0 (2006):

ectoplasm
    n 1: (spiritualism) a substance supposed to emanate from the
         body of the medium during a trance
    2: the outer granule-free layer of cytoplasm

Moby Thesaurus II by Grady Ward, 1.0:

26 Moby Thesaurus words for "ectoplasm":
   animal cell, aura, bioplast, cell, cellular tissue, cellule,
   chromatoplasm, coenocyte, corpuscle, cytoplasm, ectoplasy,
   effluvium, emanation, endoplasm, energid, eucaryotic cell,
   exteriorized protoplasm, germ cell, plant cell, plasmodium,
   procaryotic cell, protoplasm, reticulum, somatic cell, syncytium,
   trophoplasm