- racoon dog
- racquet
- racqueteer
- racy
- rad
- radameter
- radar
- radar beacon
- radar fence
- radar picket
- radar screen
- radar-homer
- radar-tracking
- radarman
- radarscope
- radcliffe
- radcm
- raddle
- radiac
- radial
- radial arrangement
- radial axle
- radial drill
- radial engine
- radial flux
- radial heating
- radial motion
- radial ply tire
- radial tire
- radial velocity
- radialized
- radian
- radiance
- radiant
- radiate
- radiation
- radiation field
- radiation meter
- radiation thermometer
- radiation-proof
- radiation-sickness
- radiation-sterilized
- radical
- radical centre
- radical chic
- radical sign
- radical word
- radicand
- radicle
- radii
臉書專頁