Pará rubber. The caoutchouc obtained from the South American euphorbiaceous tree Hevea brasiliensis, hence called the Pará rubber tree, from the Brazilian river and seaport named Pará; also, the similar product of other species of Hevea. It is usually exported in flat round cakes, and is a chief variety of commercial India rubber.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.