rais - reed
- recursive subroutine
- recursive transition network: RTN
- red
- red area
- red component
- red content
- red electron gun
- red filter
- red gun
- red heat
- red hot
- red information
- red lead
- red lead paint
- red picture
- red raster
- red signal
- red spot
- red video signal
- red wood
- red-difference signal
- red-green-blue: RGB
- red-tape operation
- redeeming feature
- redesign
- redish
- redistilled
- redocumentation
- redress bracket
- reduced
- reduced by evaporation
- reduced colour difference signal
- reduced inspection
- reduced instruction set computer: RISC
- reduced scale
- reducer
- reducing agent
- reducing atmosphere
- reducing bend
- reducing gear ratio
