• WordNet 3.6
    • n bladderwrack a common rockweed used in preparing kelp and as manure
    • n bladderwrack similar to and found with black rockweed
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Century Dictionary and Cyclopedia
    • n bladderwrack A seaweed, Fucus vesiculosus: so named from the floating-vesicles in its fronds. Also called bladder-kelp, sea-oak, and sea-wrack. See Fucus.
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In literature:

A bloated carcass of a dog lay lolled on bladderwrack.
"Ulysses" by James Joyce