kelp

(kelp)

noun

  1. any of an order (Laminariales) of large, coarse, brown algae
  2. ashes of seaweed, from which iodine is obtained

Origin: ME culp

See kelp in American Heritage Dictionary 4

noun
  1. Any of various brown, often very large seaweeds of the order Laminariales.
  2. The ash of these seaweeds, used as a source of potash and iodine.

Origin:

Origin: Middle English culp

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