- ridge tile
- ridge vent
- ridgeboard
- ridgy sands
- riding surface
- riding-house
- riffled plate
- rifling
- rift
- riftzone
- rig
- rigger
- rigging work
- right
- right bank
- right strip
- right-hand
- right-shapped
- rigid arch
- rigid bar
- rigid body
- rigid bracing
- rigid erosion
- rigid framework
- rigid joint
- rigid mode
- rigid pavement
- rigid pier
- rigid reinforcement
- rigid sheet
- rigid structure
- rigid support
- rigid suspension
- rigid tie
- rigid truss
- rigid wall
- rigid waterproofing
- rigidity condition
- rigidity index
- reverse blading
- reverse cycle
- reverse voltage
- reversed door
- reversed polarity
- reversed tension
- reversible inverter
- revision
- revolution window
- revolve
- revolving door
- revolving window
- rewind
- rezoning
- rhyolite
- rhythm
- rhythmical work
- rib
- ribbed stiffener
- ribbed vault
- ribbing factor
- ribbon foundation
- rid
- ridge board
- ridge element
- ring time
- ring wall
- rip track
- ripping timber
- riprap
- riprap cofferdam
- rise
- riser
- riser pipe
- riser plate
- rising apex
- rising gradient
- rising hole
- rising main
- risk factor
- risky adventure
- river closing
- river closure
- river development
- river dredging
- river engineering
- river flow
- river gradient
- river hydrograph
- river intake
- river loop
- river mud
- river outlet
- river plain
- river regulation
- river station
- river system
- river work
- riverside drain
- rivet
- rivet cutter