Etymology

seaboard

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Today it means: The area bordering the sea; a coastline; a sealine. Full definition →

Middle English see bord
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The story

  1. Middle English · inherited fromsee bord“porthole cover, seaward side”
  2. English todayseaboard

From earlier sea-bord, perhaps continuing (with change in meaning) Middle English see bord (“porthole cover, seaward side”), equivalent to sea + board.

Etymology from Wiktionary, CC BY-SA 4.0.