We found 19 dictionaries that define the word grinner:

General (16 matching dictionaries)

1. grinner: Merriam-Webster
2. grinner: Oxford Learner's Dictionaries
3. grinner: Collins English Dictionary
4. grinner: Vocabulary.com
5. grinner: Wordnik
6. grinner: Wiktionary
7. Grinner, grinner: Dictionary.com
8. Grinner: Wikipedia, the Free Encyclopedia
9. Grinner: Online Plain Text English Dictionary
10. grinner: Webster's Revised Unabridged, 1913 Edition
11. grinner: Rhymezone
12. Grinner: AllWords.com Multi-Lingual Dictionary
13. grinner: Webster's 1828 Dictionary
14. grinner: FreeDictionary.org
15. grinner: Mnemonic Dictionary
16. Grinner: TheFreeDictionary.com

Computing (1 matching dictionary)

17. grinner: Encyclopedia

Miscellaneous (1 matching dictionary)

18. grinner: Idioms

Slang (1 matching dictionary)

19. grinner: Urban Dictionary

(Note: See grin as well.)

Definitions from WordNet (grinner) ▸ noun:  a person who grins ▸ name:  A surname (very rare: popularity rank in the U.S.: #84324) Opposite: frowner, scowler, glum, sourpuss ▸ Words similar to grinner ▸ Usage examples for grinner ▸ Idioms related to grinner ▸ Wikipedia articles (New!) ▸ Popular adjectives describing grinner ▸ Words that often appear near grinner ▸ Rhymes of grinner ▸ Invented words related to grinner