We found one dictionary that defines the word envelope cut square:

Art (1 matching dictionary)

1. Glossary of Stamp Collecting Terms (No longer online)

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