seaweed

[see-weed]
noun
1.
any plant or plants growing in the ocean.
2.
a marine alga.

Origin:
1570–80; sea + weed1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
seaweed (ˈsiːˌwiːd)
 
n
1.  any of numerous multicellular marine algae that grow on the seashore, in salt marshes, in brackish water, or submerged in the ocean
2.  any of certain other plants that grow in or close to the sea

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

seaweed
1577, from sea + weed (q.v.).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
seaweed  [%PREMIUM_LINK%]     (sē'wēd')  Pronunciation Key 


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Any of various red, green, or brown algae that live in ocean waters. Some species of seaweed are free-floating, while others are attached to the ocean bottom. Seaweed range from the size of a pinhead to having large fronds (such as those of many kelps) that can be as much as 30.5 m (100 ft) in length. Certain species are used for food (such as nori) and fertilizer, and others are harvested for carrageenan and other substances used as thickening, stabilizing, emulsifying, or suspending agents in industrial, pharmaceutical, and food products. Seaweed is also a natural source of the element iodine, which is otherwise found only in very small amounts. See more at brown alga, green alga, red alga.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Dashi is a brilliant concoction based on kelp, a seaweed and dried bonito
  flakes.
Sunlight penetrates the shallow waters, and many kinds of organisms
  flourish-from microscopic shrimp to giant seaweed called kelp.
Bull kelp is the fastest growing seaweed in the world.
In that time, overfishing has allowed seaweed and algae to grow unchecked,
  smothering coral worldwide.
Synonyms
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