We found 9 dictionaries that define the word grinners:

General (6 matching dictionaries)

1. grinners: Merriam-Webster
2. grinners: Collins English Dictionary
3. grinners: Vocabulary.com
4. grinners: Wiktionary
5. Grinners: Wikipedia, the Free Encyclopedia
6. Grinners: TheFreeDictionary.com

Computing (1 matching dictionary)

7. Grinners: Encyclopedia

Miscellaneous (1 matching dictionary)

8. Grinners: Idioms

Slang (1 matching dictionary)

9. grinner's: Urban Dictionary

(Note: See grinner as well.)

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