What is "canterbury ball"

Canterbury \Can"ter*bur*y\ (k[a^]n"t[~e]r*b[e^]r*r[y^]), prop. n.

1. A city in England, giving its name various articles. It is the seat of the Archbishop of Canterbury (primate of all England), and contains the shrine of Thomas [`a] Becket, to which pilgrimages were formerly made.

2. A stand with divisions in it for holding music, loose papers, etc.

   Canterbury ball (Bot.), a species of Campanula of several varieties, cultivated for its handsome bell-shaped flowers.

   Canterbury gallop, a gentle gallop such as was used by pilgrims riding to Canterbury; a canter.

   Canterbury tale, one of the tales which Chaucer puts into the mouths of certain pilgrims to Canterbury. Hence, any tale told by travelers to pass away the time.