- range beacon
- Ranney well
- rapid hardening
- rare
- rarefied
- rate
- rate percent
- rating channel
- rational
- rational computation
- rationalism
- rationalization
- rationalization proposal
- ravage
- raveling
- raw clay
- raw paper
- raw soil
- razz
- re-equip
- re-pumping
- re-washing
- reach
- reaction isotherm
- reaction mixture
- reaction moment
- reaction turbine
- reactivated mortar
- reactor building
- reactor vessel
- reading error
- reading technology
- reagent mixer
- real hinge
- real size
- reaming iron
- rear tight
- rear window
- rearranging
- rebated joint
- reboot
- rebound
- rebound hammer
- rainbow roof
- rainer
- rainfall intensity
- rainless
- rainwater catchment
- rainwater gutter
- rainwater hopper
- rainwater shoe
- rainy wind
- raise
- raised arch
- raised curb
- raised flooring
- raised median
- raised platform
- raised shelf
- raising device
- raising partition
- rake
- raking
- raking balustrade
- ram
- ram lift
- rammed
- rammed clay
- rammed earth
- rammel walling
- ramming
- ramp weight
- rampant arch
- rampart
- random access
- random ashlar
- random cutting
- random excitation
- random masonry
- random test
- range finder
- range hood
- range pole
- range rod
- Rankine zone
- Ransom dam
- rapid curing
- rapid erection
- rapid filter
- rapid setting
- rasp
- rasping file
- rate control
- rate setter
- rated
- rated capacity
- rated strength
- rating
- rational formula
- rationale