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Coagulated exudate isolated from several species of the tropical tree Palaquium (Sapotaceae). It is the trans-isomer of natural rubber and is used as a filling and impression material in dentistry and orthopedics and as an insulator in electronics. It has also been used as a rubber substitute.

A horny substance, softening with heat, obtained from a Malayan evergreen tree.

[Malay.] A concrete juice resembling indiarubber.