giant kelp

noun

any of various very large kelps of the genera Laminaria, Macrocystis, and Nereocystis.

The sea is a vast reservoir of potash, and seaweed, especially the giant kelp, absorbs large quantities of this potash.

They would find that an inexhaustible supply of potash could be manufactured from the giant kelp beds of the Pacific Coast.

A specimen of giant kelp was secured from alongside of the ship, broken off at arm's length below the surface of the water.

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