from The Century Dictionary.
- noun In heraldry, a representation of the rook or castle in the game of chess, used as a bearing. It is a modern bearing, and is drawn in various fantastic ways.
Sorry, no etymologies found.
The two beautifully carved figures of a knight and his lady that lie in the Bruce Chapel are not Bruces for the surcoat of the man is adorned with the arms of the Rockcliffes -- an heraldic chess-rook and three lions 'heads.
The Evolution of an English Town Gordon Home 1923