We found 19 dictionaries that define the word thumbing:

General (12 matching dictionaries)

1. thumbing: Merriam-Webster
2. thumbing: Collins English Dictionary
3. thumbing: Vocabulary.com
4. Thumbing, thumbing: Wordnik
5. thumbing: Cambridge Advanced Learner's Dictionary
6. thumbing: Wiktionary
7. thumbing: Dictionary.com
8. thumbing: Cambridge Essential American English Dictionary
9. Thumbing: Online Plain Text English Dictionary
10. Thumbing: AllWords.com Multi-Lingual Dictionary
11. thumbing: FreeDictionary.org
12. thumbing: TheFreeDictionary.com

Business (1 matching dictionary)

13. thumbing: Legal dictionary

Computing (2 matching dictionaries)

14. Technopedia (No longer online)
15. thumbing: Encyclopedia

Medicine (1 matching dictionary)

16. thumbing: Medical dictionary

Miscellaneous (1 matching dictionary)

17. thumbing: Idioms

Slang (1 matching dictionary)

18. thumbing: Urban Dictionary

Sports (1 matching dictionary)

19. Thumbing: Sports Definitions

(Note: See thumb as well.)

Definitions from Wiktionary (thumbing) ▸ noun:  The act by which something is thumbed. Similar: finger, hitch, hitchhike, flip, riff, flick, riffle, leaf, pollex, thumbsucking, more... Opposite: indexing, pointing, indicating Types: hitchhiking, auto-hitchhiking, more... Phrases: nose thumbing, thumbing nose at, Thumbing My Way, Thumbing one's nose, more... Adjectives: much, constant, quick, casual, light, frequent, self, energetic, damp, double, delicate ▸ Words similar to thumbing ▸ Usage examples for thumbing ▸ Idioms related to thumbing ▸ Wikipedia articles (New!) ▸ Popular adjectives describing thumbing ▸ Words that often appear near thumbing ▸ Rhymes of thumbing ▸ Invented words related to thumbing