redo - rete
- redoubt
- reduced inspection
- reduced scale
- reducer
- reducing coupling
- reducing fitting
- reducing flange
- reducing pipe
- reducing tee
- reducing valve
- reduction
- reduction in area
- redundant frame
- redundant member
- reed
- reeding
- reentrant angle
- reference grid
- reference line
- reference mark
- reference plan
- reference plane
- reference point
- reference space grid
- reference surface
- reference system
- refilling
- refilling excavations
- refined tar
- reflected light
- reflected radiation
- reflected wave
- reflection
- reflective coating
- reflective glass
- reflector
- reflector lamp
- refraction index
- refractoriness under load
- refractory
