| R | a unit of absorbed ionizing radiation equal to 100 ergs per gram of irradiated material |
|---|---|
| R | measuring instrument in which the echo of a pulse of microwave radiation is used to detect and locate distant objects |
| R | a device that, on receiving radar signals, transmits coded signals in response to help navigators determine their position |
| R | a housing for a radar antenna |
| R | an electronic signal that has been reflected back to the radar antenna |
| R | gunfire aimed a target that is being tracked by radar |
| R | a radar echo displayed so as to show the position of a reflecting surface |
| R | English writer whose novel about a lesbian relationship was banned in Britain for many years (1883-1943) |
| R | mark or paint with raddle |
| R | twist or braid together, interlace |
| R | showing the wearing effects of overwork or care or suffering |
| R | worn until no longer useful |