We found 21 dictionaries that define the word grinning:

General (17 matching dictionaries)

1. grinning: Merriam-Webster
2. grinning: Oxford Learner's Dictionaries
3. grinning: Collins English Dictionary
4. grinning: Vocabulary.com
5. Grinning, grinning: Wordnik
6. grinning: Cambridge Advanced Learner's Dictionary
7. grinning: Wiktionary
8. Grinning, grinning: Dictionary.com
9. grinning: Cambridge Essential American English Dictionary
10. Grinning: Wikipedia, the Free Encyclopedia
11. Grinning: Online Plain Text English Dictionary
12. grinning: Rhymezone
13. Grinning: AllWords.com Multi-Lingual Dictionary
14. grinning: Webster's 1828 Dictionary
15. grinning: FreeDictionary.org
16. grinning: Mnemonic Dictionary
17. grinning: TheFreeDictionary.com

Computing (1 matching dictionary)

18. grinning: Encyclopedia

Medicine (1 matching dictionary)

19. grinning: Medical dictionary

Miscellaneous (1 matching dictionary)

20. grinning: Idioms

Slang (1 matching dictionary)

21. grinning: Urban Dictionary

(Note: See grin as well.)

Definitions from Wiktionary (grinning) ▸ noun:  The act or expression of one who grins. Similar: smiling, smirking, smileful, gleefulness, gleam, simper, beaming, smilet, Kool-Aid smile, gratification, more... Opposite: frowning, scowling, sneering Types: Cheshire, evil, toothy, broad, sardonic, wry, more... Phrases: grinning and bear it, grinning like a cheshire cat, Lady Grinning Soul, The Grinning Man, grinning like a fool, more... Colors:     yellow,     gold,     lemon,     amber,     canary, more... ▸ Words similar to grinning ▸ Usage examples for grinning ▸ Idioms related to grinning ▸ Wikipedia articles (New!) ▸ Popular adjectives describing grinning ▸ Words that often appear near grinning ▸ Rhymes of grinning ▸ Invented words related to grinning