Fucus vesiculosus, known by the common names bladder wrack, black tang, rockweed, bladder fucus, sea oak, cut weed, dyers fucus, red fucus, and rock wrack is a seaweed found on the coasts of the North Sea, the western Baltic Sea, and the Atlantic and Pacific Oceans. It was the original source of iodine, discovered in 1811 and was used extensively to treat goitre, a swelling of the thyroid gland related to iodine deficiency.
bladder wrack (countable and uncountable, plural bladder wracks)
- Fucus vesiculosus, seaweed widespread in the cool waters of the Atlantic and Pacific.
- Nereocystis luetkeana, kelp common on the northeastern Pacific coast.
- (Fucus vesiculosus): black tang, rockweed, bladder fucus, sea oak, black tany, cut weed, dyers fucus, red fucus, rock wrack
- (Nereocystis luetkeana): edible kelp, bull kelp, bullwhip kelp, ribbon kelp, giant kelp