quen - reco
- raceway
- raceway adiabatic flame temperature
- raceway flame temperature
- raceway slag
- rack
- rack machine
- rack-and-pinion gear
- rack-end pinion
- rack-type drawbench
- racking
- racking-type cooling bed
- rad
- radial bander
- radial compressive stress
- radial crushing strength
- radial distribution
- radial distribution curve
- radial distribution function
- radial distribution of electric-charge density
- radial draw
- radial draw forming
- radial electron density distribution
- radial extrusion
- radial forging
- radial marks
- radial modes
- radial rake
- radial scatter
- radial shrinkage on sintering
- radial-columnar
- radial-distribution method
- radial-draw forming
- Radianite
- radiant
- radiant effervescive
- radiant tube
- radiate
- radiated
- radiated structure
- radiated zeolite