Ebonite n. (Chem.) A hard, black variety of vulcanite. It may be cut and polished, and is used for many small articles, as combs and buttons, and for insulating material in electric apparatus.
... the inventor a sheet of ebonite, as a substitute for a supposed fog, two miles thick, was placed in front of the headlight. Not a glimmer was then visible to the human eye, but it appeared on the noctovisor screen as a bright red disc. ... — Astounding Stories, March, 1931 • Various
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