Source : Webster's Revised Unabridged Dictionary (1913)

Seaboard \Sea"board`\, n. [Sea + board, F. bord side.]
   The seashore; seacoast. --Ld. Berners.

Seaboard \Sea"board`\, a.
   Bordering upon, or being near, the sea; seaside; seacoast;
   as, a seaboard town.

Seaboard \Sea"board`\, adv.
   Toward the sea. [R.]

Source : WordNet®

seaboard
     n : the shore of a sea or ocean regarded as a resort [syn: {seaside}]