PLATI'NUM, noun A metal discovered in the mines of Choco in Peru, nearly of the color of silver, but less bright, and the heaviest of the metals. Its specific gravity is to that of water as 23 to 1. It is harder than iron, undergoes no alteration in air, resists the action of acids and alkalies, is very ductile and capable of being rolled into thin plates.
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Webster's Dictionary 1828
American Dictionary of the English Language, Noah Webster, 1828.