kelp

n. large brown seaweed found on the Pacific coast of America

Kelp are large seaweeds (algae), belonging to the brown algae and classified in the order Laminariales. Despite their appearance they are not grouped with the normal aquatic or land plants (kingdom Plantae), but instead are included in either kingdom Protista or Chromista. There are about 30 different genera. Kelp grows in underwater forests (kelp forests) in clear, shallow oceans, requiring nutrient-rich water below about 20 °C. It offers protection to some sea creatures, or food for others. It is known for its high growth rate — the genus Macrocystis and Nereocystis luetkeana grow as fast as half a metre a day, ultimately reaching 30 to 80 m.
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Noun
1. large brown seaweeds having fluted leathery fronds
(hypernym) brown algae
(hyponym) sea tangle, tang
(member-holonym) Laminaria, genus Laminaria

n. kelp, large brown seaweed found on the Pacific coast of America

n. kelp, large brown seaweed found on the Pacific coast of America