noun - Jetsam is (1) equipment or cargo thrown overboard to lighten a ship in distress, (2) discarded cargo or equipment found washed ashore, or (3) discarded odds and ends.
The swimmer ran into jetsam that startled her during the race.
[From earlier jetson, alteration of Middle English jetteson, a throwing overboard; see jettison.]
Note: In maritime law, Flotsam applies to wreckage or cargo left floating on the sea after a shipwreck. Jetsam applies to cargo or equipment thrown overboard from a ship in distress and either sunk or washed ashore. The common phrase Flotsam and jetsam is now used loosely to describe any objects found floating or washed ashore.