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prism[prism 词源字典]

prism: [16] The etymological idea underlying the word prism is of its shape, that of a ‘sawn-off’ piece. It comes via medieval Latin prisma from Greek prísma, a derivative of the verb prízein ‘saw’. Its optical application emerged in English at the beginning of the 17th century.
[prism etymology, prism origin, 英语词源]