Definition of seaweed noun from the Oxford Advanced Learner's Dictionary

 

seaweed

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