noun.
Goods or materials found or left on the sea floor.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
goods (or wreckage) on the sea bed that is attached to a buoy so that it can be recovered
Word Usage
"The subject of the present notice was picked up at sea, a child, and, under the provisions of maritime law concerning flotsam, jetsam, and lagan, was appropriated by the crew."