refr - resp
- refracting
- refraction error
- refractive index
- refractory
- refractory ceramics
- refractory coating
- refractory liner
- refractory liner propulsion engine
- refractory metal
- refractory paint
- refractory paper
- refrigerant condenser
- refrigerant injection
- refrigerated cabin
- refrigerated pile
- refrigerated tank
- refrigerated trailer
- refrigerated wind tunnel
- refrigeration plant
- refrigerator
- refrigerator car
- refuel truck
- refueler
- refueling
- refueling and rearming
- refueling and rearming strip
- refueling line
- refueling rate
- refueling satellite
- refuelling accessories
- refusal speed
- refused takeoff performance
- regenerate
- regenerating cartridge
- regeneration
- regenerative
- regenerative amplifier
- regenerative brake
- regenerative cooling
- regenerative life support system
