Definition from Wiktionary, the free dictionary
Alternative forms 
medevac (plural medevacs)
- The emergency transportation, usually by air, of patients to a medical facility.
- A vehicle used for emergency transportation of patients to a medical facility.
- Trained personnel who care for patients during emergency transportation to a medical facility.
- To transport patients by medevac.
Related terms 
- “medevac” in Dictionary.com Unabridged, v1.1, Lexico Publishing Group, 2006.