Source : Webster's Revised Unabridged Dictionary (1913)

Flotsam \Flot"sam\, Flotson \Flot"son\, n. [F. flotter to float.
   See {FFlotilla}, and cf. {Jetsam}.] (Law)
   Goods lost by shipwreck, and floating on the sea; -- in
   distinction from jetsam or jetson. --Blackstone.

Source : WordNet®

flotsam
     n : the floating wreckage of a ship [syn: {jetsam}]