noun. Any of various brown algae of the order Fucales growing chiefly on rocks in coastal areas, such as bladder wrack or Ascophyllum nodosum.

noun. A seaweed of the genera Fucus, Sargassum, etc., common on the rocks exposed at low tide.

noun. Any coarse seaweed growing on sea-washed rocks, especially Fucus.

noun. Ascophyllum nodosum, a seaweed also known as kelp.

noun. Fucus vesiculosus, a similar seaweed also known as bladderwrack.

noun. coarse brown seaweed growing on rocks exposed at low tide

"When gathering your equipment, look for rockweed—it's the best seaweed for clambakes because its seawater-filled pockets burst during cooking and add brininess and moisture to the other ingredients."

brown algae  

ascophyllum nodosum  black rockweed  bladder fucus  bladderwrack  fucus