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

 

seagrass

 noun
noun
BrE BrE//ˈsiːɡrɑːs//
 
; NAmE NAmE//ˈsiːɡræs//
 
[uncountable]
 
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a plant like grass that grows in or close to the sea
See the Oxford Advanced American Dictionary entry: seagrass