1) Adirondack shack 2) Ale not brewed in shed 3) Ale not drunk in shelter 4) Annexe 5) Attached building 6) Attached shed 7) Bit of rough housing 8) Cabin addition 9) Crude shed 10) Crude shelter 11) Crude structure 12) Exclusively Anglo word 13) Exclusively Saxon word 14) Farm shed 15) Having a single slope 
A lean-to is a type of simple structure originally added to an existing building with the rafters `leaning` against another wall. Free standing lean-to structures are generally used as shelters. One traditional type of lean-to is known by its Finnish name laavu. ==Lean-to buildings== A lean-to is originally defined as a building in which the raf.....
• (a.) Having only one slope or pitch; -- said of a roof. • (n.) A shed or slight building placed against the wall of a larger structure and having a single-pitched roof; -- called also penthouse, and to-fall.
A shelter consisting of a roof and at most three walls.
The lean-to is one of the simplest roofs formed by a single sloping plane. 
a roof with one slope only, built against a vertical wall. 
Lean'-to` adjective (Architecture) Having only one slope or pitch; -- said of a roof. -- noun A shed or slight building placed against the wall of a larger structure and having a single-pitched roof; -- called also penthouse , and to-fall . « The oute...
In architecture a lean-to (formerly known as a to-fall or a too-fall) is a roof having only one slope or pitch; or a shed or slight building placed against the wall of a larger structure and having a single-pitched roof.
[n] - rough shelter whose roof has only one slope
A roof with only one slope, usually formed against the side of a building.
Small extension added to a building and partially supported by the building
noun rough shelter whose roof has only one slope
A structure depending upon another structure for support and having only one slope such as a shed.