outˈrigger noun

1. A projecting spar for extending sails or any part of the rigging
2. A projecting device supported on a float, fixed to the side of a canoe, etc, to give stability
3. A projecting rowlock giving extra leverage to the oar
4. A boat having such a device or rowlocks
5. A light racing-boat with projecting rowlocks
6. A projecting beam or framework attached to a building, ship or aircraft for any of various purposes
7. A projecting frame to support the controlling planes of an aeroplane
8. An extension from the splinter-bar of a carriage to take another horse