a tree that has passed beyond maturity and is old or aged in comparison with other trees of the same species (see champion tree and veteran tree).
ancient tree (Wikipedia)
Ancient tree may refer to:
- Trees in ancient woodland
- Veteran trees, individual trees noteworthy for their age
- Ancient Tree Inventory, a project of the Woodland Trust to catalogue ancient and veteran trees
- Trees in Paleobotany, which may be fossilised
- Significant in the formation of coal
- Fossil wood, fossils of ancient trees