from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Having or characterized by a single slope or pitch: a lean-to roof; lean-to construction.
- n. A structure with a single-pitch roof that is attached to the side of a building as a wing or an extension.
- n. A shelter or shed having a roof with a single slope or pitch.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A shelter with a sloped roof; also a building with a similar construction attached to the side of a building as an extension.
from the GNU version of the Collaborative International Dictionary of English
- adj. 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.
- n. 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.
from The Century Dictionary and Cyclopedia
- Having rafters or supports pitched against or leaning on another building, a wall, or the like: as, a lean-to roof.
- n. A building whose rafters or supports pitch against or lean upon another building, or against a wall, or the like; a penthouse.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. rough shelter whose roof has only one slope
First attested 1461. (Wiktionary)