tree house

a small house, especially one for children to play in, built or placed up in the branches of a tree.

Origin of tree house

First recorded in 1895–1900

It was all about a gorgeous bird she had at home in her tree-house.

The Little House in the Fairy Wood |Ethel Cook Eliot
So away they all went, leaving the tree-house empty, and expecting to meet Mappo somewhere on the road through the jungle.

Mappo, the Merry Monkey |Richard Barnum
Oh, Gladys, I wish you could see my tree-house at Grandma's!

Marjorie's Busy Days |Carolyn Wells
But we'll have lots of fun with that tree-house; I'm going to sit up there and read, on pleasant days.

Marjorie at Seacote |Carolyn Wells

Mrs. Monkey went into the tree-house and came out with four other cocoanuts.

Mappo, the Merry Monkey |Richard Barnum