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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. See Jettison, 1. [1913 Webster] 3. Hence: Anything thrown overboard from a ship, whether floating or not. [PJC] 4. Hence: [fig.] Objects scattered about in a disorderly manner; as, he couldn't find his sneakers among the jetsam in his room. [Colloq.] [PJC]