from The Century Dictionary.
- noun A short deck peculiar to old French and Spanish ships of the line, and which was placed over the after part of the poop-deck for the exclusive use of the admiral and his staff.
Sorry, no etymologies found.
Several times during the night I had got on to the upper poop -- the deck above the poop anciently termed the poop-royal -- and looked around me.
The wreck was unquestionably some Spanish or Portuguese carrack or galleon as old as I have stated; for you saw her shape when you stood on her deck, and her castellated stern rising into a tower from her poop and poop-royal, as it was called, proved her age as convincingly as if the date of her launch had been scored upon her.
Mariner and soldier knew the story of the shadowy figure keeping company with the stars there above them on the poop-royal.