/see"bawrd', -bohrd'/ , n.
1. the line where land and sea meet.
2. a region bordering a seacoast: the Eastern seaboard.
adj.
3. bordering on or adjoining the sea.
[ 1350-1400 for earlier sense "porthole cover"; 1480-90 in phrases at, on, to seaboard on the seaward side; 1815-25 for def. 1; ME seebord. See SEA, STARBOARD ]