bo tree
noun
ˈbō- 
: peepul
… a sacred 2,200-year-old bo tree said to have grown from a sapling of the tree under which Buddha found enlightenment … 
Time Magazine
Time Magazine
Word History
Etymology
Sinhalese bō, from Sanskrit bodhi enlightenment; from Buddha receiving enlightenment under this tree — more at bid entry 1
First Known Use
1820, in the meaning defined above