/leen"tooh'/ , n. , pl. lean-tos .
1. a shack or shed supported at one side by trees or posts and having an inclined roof.
2. a roof of a single pitch with the higher end abutting a wall or larger building. See illus. under roof .
3. a structure with such a roof.
[ 1425-75; late ME; n. use of v. phrase lean to ]