Nautical. A raised walkway or platform connecting different parts of a ship, esp. one running along the sides of a ship between a raised…

= gangway, n. 2.

Originally U.S. A narrow board or plankway extending along either side of a barge or similar boat, and along which a person may walk when propelling…

Nautical. A gangway connecting two parts of a vessel. Obsolete.

(a) North American = plank road n.; (b) Nautical the narrow portion of deck between the side and the frame of the hatch in a wherry, etc.