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

 

seaboard

 noun
noun
BrE BrE//ˈsiːbɔːd//
 
; NAmE NAmE//ˈsiːbɔːrd//
 
 
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the part of a country that is along its coast Australia’s eastern seaboard The whales have been sighted along the north-eastern seaboard, from Maine to New Jersey.
See the Oxford Advanced American Dictionary entry: seaboard