From The Collaborative International Dictionary of English v.0.48:

Jetsam \Jet"sam\, Jetson \Jet"son\, n. [F. jeter to throw: cf.
   OF. getaison a throwing. Cf. Flotsam, Jettison.]
   1. (Mar. Law) Goods which sink when cast into the sea, and
      remain under water; -- distinguished from flotsam, goods
      which float, and ligan (or lagan), goods which are
      sunk attached to a buoy.
      [1913 Webster]

   2. The act of throwing objects from a ship to lighten the
      load; jettison[1]. See Jettison, 1.
      [1913 Webster]

   3. Hence: Anything thrown overboard from a ship, whether
      floating or not.

   4. Hence: [fig.] Objects scattered about in a disorderly
      manner; as, he couldn't find his sneakers among the jetsam
      in his room. [Colloq.]
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