apple_tree has definitions from the field of botany
1
[ noun ] (botany) any tree of the genus Malus especially those bearing firm rounded edible fruits

Used in print

(Helen Hooven Santmyer, "There Were Fences"...)

The only extended view possible to anyone less tall than the fences was that obtained from an upper bough of the apple_tree .

That was one epoch : the apple-tree epoch .

Once , then - for how many years or how few does not matter - my world was bound round by fences , when I was too small to reach the apple_tree bough , to twist my knee over it and pull myself up .

*