| rad | the unit of plane angle adopted under the System International d'Unites |
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| rad | a unit of absorbed ionizing radiation equal to 100 ergs per gram of irradiated material |
| rad | measuring instrument in which the echo of a pulse of microwave radiation is used to detect and locate distant objects |
| rad | a device that, on receiving radar signals, transmits coded signals in response to help navigators determine their position |
| rad | a housing for a radar antenna |
| rad | an electronic signal that has been reflected back to the radar antenna |
| rad | gunfire aimed a target that is being tracked by radar |
| rad | a radar echo displayed so as to show the position of a reflecting surface |
| rad | English writer whose novel about a lesbian relationship was banned in Britain for many years (1883-1943) |
| rad | mark or paint with raddle |
| rad | twist or braid together, interlace |
| rad | showing the wearing effects of overwork or care or suffering |