paper knife

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noun

a small, often decorative, knifelike instrument with a blade of metal, ivory, wood, or the like, for slitting open envelopes, the leaves of books, folded papers, etc.
the blade of a paper cutter.

Origin of paper knife

First recorded in 1800–10
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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Historical Examples of paper knife