lean-to

Webster's Dictionary (1913)

Architecture Having only one slope or pitch; — said of a roof.

1. Architecture 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 outer circuit was covered as a lean-to, all round this inner apartment.— Daniel De Foe

2. A crude, usually temporary shelter comprising a lean-to roof braced against any convenient support, as a wall, a tree or a pole. The roof may extend all the way to the ground.

Webster’s Revised Unabridged Dictionary (1913), from GCIDE 0.54 · with additions: GCIDE editors