Etymology
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jetsam (n.)

1560s, jottsome "act of throwing goods overboard to lighten a ship," alteration and contraction of Middle English jetteson, from Anglo-French getteson, Old French getaison "a throwing" (see jettison). Intermediate forms were jetson, jetsome; the form perhaps was deformed by influence of flotsam. From 1590s as "goods thrown overboard;" figurative use by 1861. For distinction of meaning, see flotsam.

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Definitions of jetsam

jetsam (n.)
the part of a ship's equipment or cargo that is thrown overboard to lighten the load in a storm;
jetsam (n.)
the floating wreckage of a ship;
Synonyms: flotsam
From wordnet.princeton.edu