We found 5 dictionaries that define the word test-flying:

General (4 matching dictionaries)

1. test-flying: Merriam-Webster
2. test-flying, test-flying: Collins English Dictionary
3. test-flying: Dictionary.com
4. test-flying: TheFreeDictionary.com

Computing (1 matching dictionary)

5. test-flying: Encyclopedia

(Note: See test-fly as well.)

Definitions from Wiktionary (test-fly) ▸ verb:  To fly an aircraft in order to evaluate its performance ▸ Also see test-fly ▸ Words similar to test-flying ▸ Usage examples for test-flying ▸ Idioms related to test-flying ▸ Wikipedia articles (New!) ▸ Words that often appear near test-flying ▸ Rhymes of test-flying ▸ Invented words related to test-flying