Definition of seaweed noun from the Oxford Advanced American Dictionary

 

seaweed

 noun
noun
NAmE//ˈsiwid//
 
[uncountable, countable]
 
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a plant that grows in the ocean or on rocks at the edge of the ocean. There are many different types of seaweed, some of which are eaten as food.
See the Oxford Advanced Learner's Dictionary entry: seaweed