paperknife paper joint • paper knife · · · Info · Definitions · Synonyms · Characters · · paperknife · · Text Latin · · Script 10 · · 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. · · Noun Definition 1 Synonyms · · · letter opener · · Synonym 1 paper knife · · Synonym 2 Characters · · 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