• WordNet 3.6
    • n rockweed coarse brown seaweed growing on rocks exposed at low tide
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Webster's Revised Unabridged Dictionary
    • n Rockweed (Bot) Any coarse seaweed growing on sea-washed rocks, especially Fucus.
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Century Dictionary and Cyclopedia
    • n rockweed A seaweed of the genera Fucus, Sargassum, etc., common on the rocks exposed at low tide. Fucus vesiculosus and F. nodosus are especially abundant on the New England coast. See Fucus (for description and cut) and kelp, 1 . Also called rock-kelp.
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In literature:

You'll find your dory in the rockweed about fifty feet east of the cove.
"Jim Spurling, Fisherman" by Albert Walter Tolman
As soon as the rockweed is thrown on the red hot stones a salty, savory smelling steam begins to rise.
"Suppers" by Paul Pierce
There was but little weed cast up here, and that kelp chiefly, there being scarcely a rock for rockweed to adhere to.
"Cape Cod" by Henry D. Thoreau
Beyond the sand are great pebbles covered with rockweed and barnacles.
"The Clammer and the Submarine" by William John Hopkins

In news:

A thick layer of Maine rockweed goes on top of the stones, providing the steam and much of the briny flavor.
At last count the "Rockweed Registry" maintained by the Downeast Coastal Conservancy included 532 oceanfront properties in 12 communities, most fronting Cobscook Bay.
Harvesters of periwinkles and rockweed are crossing paths in eastern Maine.