This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Wreckage or cargo that remains afloat after a ship has sunk.

n. Floating refuse or debris.

n. Discarded odds and ends.

n. Vagrant, usually destitute people.

n. Debris floating in a river or sea, in particular fragments from a shipwreck.

n. Goods lost by shipwreck, and floating on the sea; -- in distinction from jetsam or jetson.

n. Such part of the wreck of a ship and its cargo as is found floating. See jetsam.

n. the floating wreckage of a ship

"Rourke describes its dark banks well: its trolley-littered bed, its murky depths, its surface covered in flotsam and streaks of oily pollution."

flotson   

wreckage   

jetsam    dotsam   

flotsam and jetsam   

driftwood    wreckage    seaweed    blubber    coralite    débris    kelp    detritus