India-rubber. The chief substance contained in the milky juice that exudes upon incision of a number of tropical trees belonging to the natural orders Etiphorbiacece, Arto- carpacece, and Apocynacece. The juice is a vegetable emulsion, the caoutchouc being suspended in it in the form of minute transparent globules. When pure, caoutchouc is nearly white, soft, elastic, and glutinous; it swells up in water without dissolving; the best solvents are carbon disulphid and chloroform. It melts at about 150

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Definition of  CAOUTCHOUC