Webster's Revised Unabridged Dictionary · 1913

Ectoplasm

Ectoplasm , noun

[Ecto- + Greek {not transcribed} form.]

(a)
(Biology) The outer transparent layer of protoplasm in a developing ovum.
(b)
(Biology) The outer hyaline layer of protoplasm in a vegetable cell.
(c)
(Biology) The ectosarc of protozoan.