bull kelp
noun
plural bull kelps
: any of various very large brown algae (such as of the genera Durvillaea and Nereocystis)
especially
: a large kelp (Nereocystis luetkeana) found chiefly from Alaska to California that often forms dense stands, may reach a length of 130 feet (40 meters), and has a single large gas-filled air bladder at the end of the stipe from which arise two clusters of long narrow blades
The bull kelp forests off Northern California are sometimes spoken of as the redwoods of the sea. —David Helvarg
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Merriam-Webster unabridged
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