We found 7 dictionaries that define the word registration mark:

General (2 matching dictionaries)

1. registration mark: TheFreeDictionary.com
2. registration mark: Wiktionary

Art (1 matching dictionary)

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

Business (2 matching dictionaries)

4. registration mark: Legal dictionary
5. registration mark: Financial dictionary

Computing (1 matching dictionary)

6. registration mark: Encyclopedia

Medicine (1 matching dictionary)

7. registration mark: Medical dictionary

Definitions from Wiktionary (registration mark) ▸ noun:  Synonym of traffic light (“the colored dots on stamp sheet margins printed with offset printing or photogravure methods”) ▸ Words similar to registration mark ▸ Usage examples for registration mark ▸ Idioms related to registration mark ▸ Wikipedia articles (New!) ▸ Words that often appear near registration mark ▸ Rhymes of registration mark ▸ Invented words related to registration mark