retr - s-qu
- retransmission
- retrapping
- retro-reflecting surface
- retro-reflection
- retro-reflector
- retroaction
- retrodirective mirror
- retrodirective reflector
- retrograde
- retrograde motion
- retrograde precession
- retrograde rotation
- retroreflecting mirror
- retroreflecting optical unit
- retroreflector
- return
- return albedo
- return beam
- return convection
- return flow
- return header
- return motion
- return of comet
- return paradox
- return passage
- return primary wave
- return radiation
- return speed
- return spring
- return wave
- return-flow wind tunnel
- returnable container
- returned power
- returned signal
- reveal
- reverberant sound
- reverberating
- reverberation
- reverberation chamber
- reverberation disturbance
