GNU Collaborative International Dictionary of English

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Found one definition

1.       
   { ‖Jetsam , ‖Jetson , } n. [F. jeter to throw: cf. OF. getaison a throwing. Cf. Flotsam, Jettison.]
   (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
   The act of throwing objects from a ship to lighten the load; jettison{1}. See Jettison, 1.
   1913 Webster
   Hence: Anything thrown overboard from a ship, whether floating or not.
   PJC
   Hence: [fig.] Objects scattered about in a disorderly manner; as, he couldn't find his sneakers among the jetsam in his room. [Colloq.] 
   PJC