I. ˈlēn-ˌtü noun
( plural lean-tos -ˌtüz)
Date: 15th century
1. : a wing or extension of a building having a lean-to roof
2. : a rough shed or shelter with a lean-to roof
II. adjective
Date: 1649
: having only one slope or pitch
a lean-to roof
— see roof illustration