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| Ring rot | | Circular rot in a log. Any rot localized mainly in ... |
| Rip | | to make a longitudinal cut in a log or board. ... |
| rip saw | | a saw with a tooth configuration appropriate for making longitudinal ... |
| Riparian right | | Right of someone owning land located on the bank of ... |
| Riprap | | Rough stones of various sizes placed compactly or irregularly on ... |
| Road | | Skid road in skidder or high-lead logging. Cleared path along ... |
| Road pattern | | Characteristic arrangement of spur roads in relation to each other ... |
| Rod | | Surveying instrument made of wood and graduated in feet and ... |
| Rod assemblies | | Where the gland, wipers, O-rings, and packing are found in ... |
| Rolling resistance | | Retarding force of the ground against the wheels of a ... |
| Root rot | | Disease that destroys tree roots, often killing the tree ... |
| Rops | | Roll-over protective structures that protect the operator if a machine ... |
| Rosser | | Machine that peels bark using knives ... |
| Rotation | | Period of years between establishment of a stand of timber ... |
| Rough cut | | Lumber that has not been dressed (surfaced) but which as ... |
| Roundwood | | A length of cut tree generally having a round cross-section, ... |
| Roundwood products | | Logs, bolts, or other round sections cut from trees for ... |
| RPM | | Revolutions per minute. ... |
| Rub tree | | Tree used as a fender or pivot to protect the ... |
| Running line | | Moving cable ... |
| Running skyline | | System of two or more suspended moving lines, generally referred ... |
| Rust Reaper | | Rust Reaper is a long time and loyal sponsor of ... |
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