giant kelp
noun
plural giant kelps
: a very large, fast-growing brown alga (Macrocystis pyrifera) of cool oceans that often grows in dense patches, may reach a length of 150 feet (45 meters), and has long stipes from which arise leaflike blades with gas-filled air bladders at their base
… giant kelp, the majestic floating seaweed species common to Monterey Bay …—Peter Fimrite
Gliding through the frigid waters, I marveled at how the light filtered down through the healthy forests of giant kelp—a humongous species of brown algae …—Ashley Harrell
Giant kelps bent to the seafloor from the weight of the mussels growing on them.—Enric Sala
called also bladder kelp, giant bladder kelp
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Merriam-Webster unabridged
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