- Def: Ectoplasm 1. Biology. the outer portion of the cytoplasm of a cell; 2. can refer to the outer bodily regions of the jelly fish; 3. Spiritualism. the supposed emanation from the body of a medium; 4. substance or spiritual energy "exteriorized" by physical mediums; 5. Aerospace. a term used to describe the vapour appearing on the wings of an aircraft when it is performing high-energy manoeuvres. Typically this effect is seen by most people at airshows during modern jet fighter aerobatic displays. See also St. Elmo's Fire. This effect also has other names in other parts of the world; 6. A cocktail made with vodka.
- Origin: 1880–85; ecto- + -plasm;
- Synonyms: corpuscle, ectoplasm, egg, embryo, follicle, germ, haematid, microorganism, nucleus, plastid, spore, unit, utricle, vacuole.