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| Underbrush | | Brush under a stand of timber ... |
| Undercut | | Wedge-shaped notch cut in the base of a tree to ... |
| Understory | | 1.) Foliage layer beneath the forest canopy.
2.) Young trees that ... |
| Uneven-aged management | | Silvicultural system in which individual trees originate at different times ... |
| Uninvited (Un-Invited) | | To be Banned from the Forestry Forum, also dismembered. ... |
| Unmerchantable wood | | Material that is unsuitable for conversion to industrial wood products ... |
| unobtainium | | Term used in jest to imply that something is no ... |
| Upper stem portion | | Sawtimber tree bole extending from above the merchantable top to ... |
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