ebonite(n = noun.substance) hard rubber, vulcanite - a hard nonresilient rubber formed by vulcanizing natural rubber;
is a kind of caoutchouc, gum elastic, india rubber, natural rubber, rubber
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. [1913 Webster]
ebonite, n. = VULCANITE.
Etymology:
EBONY + -ITE(1)