deckplate

Noun

1. A watertight plate (purlin) at the edge of a deck.
2. A plate forming a deck in non-nautical applications.
   • The fuel for the engines and boiler is carried in four tanks of equal capacity below the deckplate between the inner axles of the bogies, in spaces formed by the plates of the underframe. - 1958 September 5, “Swindon's...