Definition from Wiktionary, the free dictionary
taffrail (plural taffrails)
- (nautical) The curved wooden top of the stern of a sailing man-of-war or East Indiaman, usually carved or decorated.
- (nautical) The rail around the stern of a ship.
- (nautical) The deck area at the stern of a vessel.
Derived terms 
rail around the stern of a ship