What is a compound, originally made from gun cotton and castor oil, but later from different materials, and used as a substitute for vulcanized India rubber and for ivory; -- called also xylotile called?

parkesine — A compound, originally made from gun cotton and castor oil, but later from different materials, and used as a substitute for vulcanized India rubber and for ivory; -- called also xylotile. (Webster's 1913.)