Etymology
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seaboard (n.)

late 15c., "seaward side of a ship," a sense now obsolete; from sea + board (n.2). The meaning "seashore, coastline" is by 1788.

updated on March 09, 2022

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Definitions of seaboard from WordNet

seaboard (n.)
the shore of a sea or ocean regarded as a resort;
Synonyms: seaside
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.