wrack 2 also rack 
(răk)
(răk)n.
1.
a. Wreckage, especially of a ship cast ashore.
b. Chiefly British Violent destruction of a building or vehicle.
2.
a. Seaweed that has been cast ashore or dried.
b. Any of various brown algae, especially rockweed or kelp.
v. wracked, wrack·ing, wracks also racked or rack·ing or racks
v.tr.
To cause the ruin of; wreck.
v.intr.
To be wrecked.
[Middle English wrak, from Middle Dutch.]