1. dull knife used to cut open the envelopes in which letters are mailed or to slit uncut pages of books; [syn: letter opener, paper knife, paperknife]
WordNet (r) 3.0 (2006):
letter opener
n 1: dull knife used to cut open the envelopes in which letters
are mailed or to slit uncut pages of books [syn: letter
opener, paper knife, paperknife]