letter_opener
1. [ noun ] dull knife used to cut open the envelopes in which letters are mailed or to slit uncut pages of books
Synonyms: paper_knife paperknife
Related terms: knife
Similar spelling:   letter_paper
  letter-perfect
  letter_of_marque
  letter_of_intent
  letter_of_credit
  letter_box
  letterpress
  letter_bond
  letter_bomb