We found one dictionary that defines the word informal letter:

General (1 matching dictionary)

1. Informal letter: Wikipedia, the Free Encyclopedia

▸ Words similar to informal letter ▸ Usage examples for informal letter ▸ Idioms related to informal letter ▸ Wikipedia articles (New!) ▸ Words that often appear near informal letter ▸ Rhymes of informal letter ▸ Invented words related to informal letter