Druid oak
A Druid Oak is a large oak tree found in many ancient forests in Britain. Many such forests have named Druid Oaks - one such example being the Druid's Oak at Burnham Beeches.[1] There are also rare examples at Salcey Forest, in Northamptonshire. Typically such trees will be hundreds of years old.
Druids Oak, the oldest tree in Burnham Beeches
The name relates to the ancient Druids who met in forests' Oak groves and in particular beneath the old Oak trees. It is interesting to note that one etymology of the word Druid comes from "dru-wid", which means "knower of oak trees".[2]