Wreckage lying on the sea bed. One of the rights in the Charter of the *Cinque Ports granted in 1155 was title to such wreckage. It is not to be confused with flotsam = wreckage floating on the sea, or jetsam = goods and wreckage on the beach. -
Cf. Scipbryce
Dictionary of Medieval Terms and Phrases. Christopher Coredon with Ann Williams.