a spar, beam, or framework projecting from a ship's side, e.g. to secure a mast
a projecting framework by which a float is attached beside a canoe to give it greater stability, or a canoe so equipped
a member projecting from a main structure to provide additional stability or support something
[perhaps an alteration, by association with rig2, of obsolete outligger a spar for extending a sail, from Dutch uitligger outlier]