outrigger

(nautical) Any of various projecting beams or spars that provide support for a sailing ship's mast.

(nautical) A long thin timber, pontoon, or other float attached parallel to a canoe or boat by projecting struts as a means of preventing tipping or capsizing.

(rowing) An outrigger canoe or boat.

(nautical) An iron bracket or brace for an oarlock projecting from the side of a rowing boat.

An extension mechanism, often retractable when not in use, on a boat, vehicle, or structure which helps to stabilize it to keep it from tipping over.

(skiing) A type of ski pole, with skis attached at the bottom, instead of the spike/pick found on a normal pole. It is used in downhill skiing variants of para-skiing, especially those that use a sit-ski, such as the monoski.