paper knife paperknife • paper lapper · · · Info · Definitions · Synonyms · Characters · · paper knife · · Text Common · · Latin · · Scripts 11 · · Length 3 · · Syllables Definitions · · · (noun) dull knife used to cut open the envelopes in which letters are mailed or to slit uncut pages of books. Synonyms: letter opener, paper knife, paperknife. · · Noun Definition 1 Synonyms · · · letter opener · · Synonym 1 paperknife · · Synonym 2 Characters · · space U+0020 a latin small letter a U+0061 e latin small letter e U+0065 f latin small letter f U+0066 i latin small letter i U+0069 k latin small letter k U+006B n latin small letter n U+006E p latin small letter p U+0070 r latin small letter r U+0072