Sphaeristerium Latin, from the (Greek σφαιριστήριον, σφαῖρα, ball), the term in classic architecture given to a large open space connected with the Roman thermae, for exercise with balls after the bather had been anointed; they were also provided in the Roman villas. == Sports == In Italian sferisterio is nowadays the courtfiel...
An open court or roofed room, where ballgames were played. 
Ball-playing court