As far as I know, this usage of the term originated with Ghostbusters, though I have seen it used now and again in other places since then.
As far as I know, the term originated from various early american mystics, who would secrete the substance when in their trances. There could be previous uses.
Ec"to*plasm (?), n. [Ecto- + Gr. form.] Biol. (a)
The outer transparent layer of protoplasm in a developing ovum
The outer hyaline layer of protoplasm in a vegetable cell
The ectosarc of protozoan.
© Webster 1913.
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