roofing system - sampler
- rose head
- rose molding
- rose window
- rosehead
- rosette
- Rosie O'Moore
- rosin
- rosin oil
- Rossi-Forel scale
- rostral
- rostral column
- rostralated
- rostrum
- rot
- rot of wood
- rot-resisting timber
- rota
- rotameter
- rotary
- rotary air pump
- rotary biological contactor
- rotary bored cast-in-place pile
- rotary boring
- rotary breaker
- rotary bridge
- rotary car dump
- rotary casting
- rotary compressor
- rotary cooler
- rotary core drilling
- rotary crane
- rotary crusher
- rotary device
- rotary distributor
- rotary ditcher
- rotary drill
- rotary drilling
- rotary dryer
- rotary engine
- rotary evaporator