We found 20 dictionaries that define the word great grandfather:

General (16 matching dictionaries)

1. great-grandfather: Oxford Learner's Dictionaries
2. great-grandfather, great-grandfather: Collins English Dictionary
3. great grandfather: Vocabulary.com
4. Great-Grandfather, Great-grandfather, great-grandfather: Wordnik
5. great-grandfather, great grandfather: Wiktionary
6. great-grandfather: Infoplease Dictionary
7. Great-grandfather, great-grandfather, great grandfather: Dictionary.com
8. Great-grandfather: Wikipedia, the Free Encyclopedia
9. Great-grandfather: Online Plain Text English Dictionary
10. great-grandfather: Webster's Revised Unabridged, 1913 Edition
11. great grandfather: Rhymezone
12. Great-grandfather: AllWords.com Multi-Lingual Dictionary
13. great-grandfather, great grandfather: FreeDictionary.org
14. great grandfather: Mnemonic Dictionary
15. great-grandfather, great grandfather: TheFreeDictionary.com
16. great-grandfather: Wikimedia Commons US English Pronunciations

Business (2 matching dictionaries)

17. Great-grandfather: Legal dictionary
18. Great-grandfather: Financial dictionary

Computing (1 matching dictionary)

19. Great-grandfather: Encyclopedia

Medicine (1 matching dictionary)

20. Great-grandfather: Medical dictionary

(Note: See great_grandfathers as well.)

Definitions from Wiktionary (Great grandfather) ▸ noun:  Alternative spelling of great-grandfather [The father of one's grandparent.] Similar: great grandparent, great great grandparent, great grandson, great grandmother, grand uncle, great uncle, great grandchild, grand-uncle, greatgrandson, great great grandchild, more... Opposite: great grandchild, descendant, progeny Phrases: great great grandfather, great great grandfather, more... Adjectives: grand, aval, gammy, pappy, poppy, grandfatherly, granny, avunculate, grandpaternal, pa, novercal ▸ Words similar to great grandfather ▸ Usage examples for great grandfather ▸ Idioms related to great grandfather ▸ Wikipedia articles (New!) ▸ Words that often appear near great grandfather ▸ Rhymes of great grandfather ▸ Invented words related to great grandfather