- rectifying column
- rectifying section
- recycle mixing
- recycle ratio
- recycle stock
- red bed
- red lead
- red oil
- red oxide
- red-sensitive
- reddle
- redistill
- redox reaction
- redrilling
- reds
- reduced
- reduced oil
- rectifying plate
- recycle gas
- red antimony
- red liquor
- red rock
- redistribution reaction
- redrill
- reduced mass
- reduced steam
- reducer
- reducing power
- reducing zone
- reductibility
- reduction factor
- reduction ratio
- reduction slag
- reduction tube
- reductive agent
- redwood
- reef
- reef flat
- reef growth
- reeling
- reeling machine
- reference
- reference fuel
- reference temperature
- refined
- refined bitumen
- refined lead
- refined oil
- refined petroleum
- refined steel
- refined tank
- refined wax
- refinery
- refinery gas
- refinery scum
- refining
- refining company
- refining glass
- refining process
- refinishing paint
- reflected heat
- reflection shooting
- reflux condenser
- reflux duty
- reformat
- reformed gas
- reforming stock
- refracted wave
- refractories
- refractory ore
- refractory porcelain
- refreezing
- refrigerant discharge
- refrigerant superheat
- refrigerated storage
- refuel
- refuelling
- refund
- refuse
- refusion
- regelation
- regenerate
- regenerator
- regional anomaly
- regional metamorphism
- regional migration
- regional unconformity
- red arsenic
- red hardness
- red ocher
- redistillation
- redox potential
- redruthite
- reduced temperature
- reducible
- reducing bath
- reducing elbow
- reducing flange
- reducing still
- reduction furnace