书函

書函
shūhán
  1. letter
  2. correspondence
  3. slipcase

CEDICT

  1. letter; correspondence; written correspondence
  2. slipcase; book cover

Wiktionary

书信的封套，引申为书信。

重編國語辭典

Entry Composition

1 书 shū
  1. book
  2. letter
  3. document
  4. to write

classifiers: 本, 冊, 部
=2 函 hán
  1. envelope
  2. case
  3. letter
=2 函 hán variant of 函 hán

Related entries

信 xìn
  1. letter
  2. mail
  3. to trust
  4. to believe
  5. to profess faith in
  6. truthful
  7. confidence
  8. trust
  9. at will
  10. at random

classifier: 封

信寫完了。

The letter was finished.

Source: Tatoeba

信件 xìnjiàn letter (sent by mail)
该信件未署名。

This letter bears no signature.

Source: Tatoeba

信函 xìnhán
  1. letter
  2. piece of correspondence (incl. email)
他写了一封信函认证的讨论了那个事情。

He wrote a letter dealing with the matter in all seriousness.

Source: Tatoeba

信札 xìnzhá letter
信笺 xìnjiān
  1. letter
  2. letter paper
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