letter opener letter of the alphabet • letter paper · · · Info · Definitions · Synonyms · Characters · · letter opener · · Text Common · · Latin · · Scripts 13 · · Length 5 · · 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 · · · paper knife · · Synonym 1 paperknife · · Synonym 2 Characters · · space U+0020 e latin small letter e U+0065 l latin small letter l U+006C n latin small letter n U+006E o latin small letter o U+006F p latin small letter p U+0070 r latin small letter r U+0072 t latin small letter t U+0074