| Radlaufkurve | cycloid |
| Radarkuppel | radar dome |
| Radlader | loader |
| Radlager | wheel bearing |
| Adlerfarne | bracken |
| Bandlaufwerk | tape deck tape drive |
| Grasläufer | buff-breasted sandpiper |
| Anlaufphase | ramp-up seed phase start-up phase |
| Blausäure | hydrogen cyanide prussic acid hydrocyanic acid |
| Rateaufgabe | enigma |
| Schlafkur | narcotherapy |
| Hüllkurve | envelope |
| Sinuskurve | sinusoid |
| Lernkurve | learning curve |
| Rechtskurve | right-hand bend |
| Walküre | valkyrie Valkyrie |
| Radeseuche | bejel |
| Radikale | radical |
| Radiolarie | radiolarian |
| Radkappe | hubcap |