We found 15 dictionaries that define the word on the wing:

General (13 matching dictionaries)

1. on the wing: Merriam-Webster
2. on the wing: Oxford Learner's Dictionaries
3. on the wing: Collins English Dictionary
4. on the wing: Vocabulary.com
5. on the wing: Wordnik
6. on the wing: Cambridge Advanced Learner's Dictionary
7. on the wing: Wiktionary
8. On the wing, on the wing: Dictionary.com
9. On the Wing: Wikipedia, the Free Encyclopedia
10. on the wing: Rhymezone
11. on the wing: FreeDictionary.org
12. on the wing: Mnemonic Dictionary
13. on the wing: TheFreeDictionary.com

Medicine (1 matching dictionary)

14. on the wing: Merriam-Webster Medical Dictionary

Miscellaneous (1 matching dictionary)

15. on the wing: Idioms

(Note: See on_the_wings as well.)

Definitions from WordNet (on the wing) ▸ adverb:  flying through the air Opposite: grounded, stationary, still, landed, settled Types: alighting, perching, roosting, hovering, more... Phrases: bird on the wing, be on the wing, Pigs on the Wing, more... ▸ Words similar to on the wing ▸ Usage examples for on the wing ▸ Idioms related to on the wing ▸ Wikipedia articles (New!) ▸ Words that often appear near on the wing ▸ Rhymes of on the wing ▸ Invented words related to on the wing