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| D.b.h. (DBH) | | Diameter of the tree at breast height. ... |
| D.g.l. | | Diameter at groundline. ... |
| D.i.b. | | Diameter inside bark. ... |
| D.o.b. | | Diameter outside bark. ... |
| DanG | | An allowable expletive used on the forestry forum, taken from ... |
| Day rate | | Method of paying loggers by the day or hour instead ... |
| Deadening | | Area on which timber has been killed by fire, flooding, ... |
| Deadhead | | In transport, a vehicle traveling outbound or inbound without a ... |
| Deadman | | Anchoring device buried in the ground to which a guy ... |
| Debarker | | 1.) Machine for removing bark from logs or bolts.
2.) Machine ... |
| Debarking | | Removing the outer protective layer (bark) from trees or parts ... |
| Deck | | 1.) Pile of logs on a landing.
2.) Area or platform ... |
| Defect | | Crook, conk, decay, split, sweep, or other injury that decreases ... |
| Deflection | | Vertical distance between the chord and the skyline, measured at ... |
| Defoliators | | 1.) Insects that destroy foliage.
2.) Chemicals that cause plants to ... |
| Degrade | | Any defect that lowers the grade or quality of a ... |
| Delimber | | Self-propelled or mobile machine designed to remove all limbs from ... |
| Delimber bucker | | Used to delimb and slash trees. Also known as a ... |
| Delimber buncher | | Used to delimb trees and arrange logs in piles on ... |
| Delimber slasher | | Used to delimb and slash trees. Also known as a ... |
| Delimber slasher buncher | | Used to delimb and slash trees and arrange logs in ... |
| Delimbing | | Removing branches from trees. ... |
| Delimbing gate | | Metal grid used with a skidder for removing limbs. ... |
| Dendrology | | Study and identification of trees. ... |
| Dendrology | | Dendrology is the study of woody plants. These includes trees: ... |
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