letter opener

(redirected from Thing used to open mail)
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Noun1.letter opener - dull knife used to cut open the envelopes in which letters are mailed or to slit uncut pages of booksletter opener - dull knife used to cut open the envelopes in which letters are mailed or to slit uncut pages of books
knife - edge tool used as a cutting instrument; has a pointed blade with a sharp edge and a handle