We found one dictionary that defines the word vertical pair imperforate horizontally:

Art (1 matching dictionary)

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

▸ Words similar to vertical pair imperforate horizontally ▸ Usage examples for vertical pair imperforate horizontally ▸ Idioms related to vertical pair imperforate horizontally ▸ Wikipedia articles (New!) ▸ Words that often appear near vertical pair imperforate horizontally ▸ Rhymes of vertical pair imperforate horizontally ▸ Invented words related to vertical pair imperforate horizontally