In botany, trunk (or bole) refers to the main reproductive member of a tree that supports the branches and is supported by and directly attached to the roots. The trunk is covered by the bark, which is an important diagnostic feature in tree identification, and which often differs markedly from the bottom of the trunk to the top, depending on the species. The trunk is the most important part of the tree for timber production.
Trunks can be vulnerable to damage, including sunburn.
In common parlance, bole is often used to denote the scar on a trunk where a branch has been removed, leaving a smooth cut face and a raised ring of bark closing in around the edge
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