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Medical Word Parts - Letter: r
| Term | Definition |
| rachi/o | spinal column |
| radi/o | x-rays, radius |
| radicul/o | nerve root |
| ram/i | branch |
| re- | again, back |
| -receptor | receiver |
| rect/o | rectum |
| ren/o | kidney |
| respir/o | breathing |
| resuscit/o | revive |
| reticul/o | net, network |
| retin/o | retina |
| retro- | backward |
| rhabd- | rod |
| rhabdomy/o | striated muscle |
| rhe/o | stream, flow, electric current |
| rhin/o | nose |
| rhiz/o | root |
| rhodo- | red |
| rhythm/o | rhythm |
| rhytid/o | wrinkle |
| rot- | wheel, turn |
| -rrhage | bursting forth |
| -rrhaphy | suture |
| -rrhea | discharge, flow |
| -rrhexis | rupture |