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Seaweed (ˈsiːwiːd) Noun
A plant-like organism that lives in the sea or ocean, often green or brown, but can also be yellow. It is a type of algae and can range in size from microscopic to very large, like kelp.
The beach was littered with yellow seaweed after the storm.
Etymology: The term "seaweed" comes from the Old English "sǣwȳd", which is a compound of "sǣ" (sea) and "wȳd" (weed).
Alternatives: Algae, Kelp, Marine Algae