- ramin
- ramming
- rancid
- rancidity
- randanite
- random orientation
- random solution
- range oil
- ranger finder
- Rankine scale
- ranking
- rapakiwi
- rapeseed oil
- rapid cement
- rapid curing
- Raschig process
- rat distillate
- rate action
- rate process
- rated potential
- ravision oil
- Rayleigh distillation
- re-crystallize
- reaction chamber
- reaction product
- reactivation
- reactive solvent
- reactivity
- reaming
- rebellious ore
- recall
- receiving drum
- receiving hopper
- reception coil
- receptor
- recess tank
- recipe
- raised shoreline
- ralstonite
- random distribution
- random packing
- range
- rank wildcat
- rapid steel
- rare earth
- Raschig ring
- rashing
- raspite
- rating apparatus
- raw coal
- raw material
- raw rubber
- Rayleigh number
- re-carburized
- re-crusher
- reaction border
- reaction period
- reaction stage
- reactivate
- real bearing
- ream
- reaming bit
- reassemble
- receipts
- recent formation
- recessional moraine
- reclaim
- reclaimed rubber
- recoil oil
- recompression
- recompression station
- recondition
- reconditioning
- reconnaissance map
- recording cylinder
- recovery creep
- recovery ratio
- rectification column
- rectification distillation
- rectified petroleum
- rear axle
- rebound elasticity
- recalescence
- receivables
- receiver
- receiving house
- receiving tank
- recent epoch
- recess pond
- reciprocal time
- reciprocating pump
- recirculating brine
- reclaim mix
- recomposed granite
- reconditioning plant
- recording gravimeter
- recoverable
- recovery factor
- recovery rate
- rectifier