goods cast overboard deliberately, as to lighten a vessel or improve its stability in an emergency, which sink where jettisoned or are washed ashore.
Also, jetsom.
Compare flotsam, lagan.

1560–70; alteration of jetson, syncopated variant of jettison

flotsam, jetsam. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
jetsam or jetsom (ˈdʒɛtsəm)
1.  flotsam Compare lagan that portion of the equipment or cargo of a vessel thrown overboard to lighten her, as during a storm
2.  another word for flotsam
[C16: shortened from jettison]
jetsom or jetsom
[C16: shortened from jettison]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1570, alteration of M.E. jetteson "act of throwing goods overboard to lighten a ship," from Anglo-Fr. getteson (see jettison). Form perhaps influenced by flotsam. For distinction of meaning, see flotsam.
Online Etymology Dictionary, © 2010 Douglas Harper
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