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The caoutchouc obtained from the South American euphorbiaceous tree Hevea brasiliensis, hence called the Para rubber tree, from the Brazilian river and seaport named Para; 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, Noah. Entry for 'Para Rubber'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/p/para-rubber.html. 1828.