In extended use. Any of various structures which give the occupant a conspicuous or elevated position… Nautical †(a) The poop of a sailing ship…

the poop of a ship.

The deck at the stern of early ships (see deck, n.1 2); poop-deck, poop. (Cf. fore-deck, n.)

The aftermost part of a ship; the stern; the aftermost and highest deck often forming (esp. in a wooden ship) the roof of a cabin in the stern.

the deck forming the roof of the poop-cabin; a topgallant poop.

a poop deck built lower and smaller than usual, sometimes on top of a main poop deck.