Costard

n. [ Prob. fr. OF. coste rib, side, F. côte, and meaning orig., a ribbed apple, from the ribs or angles on its sides. See Coast. ] 1. An apple, large and round like the head. [ 1913 Webster ]

Some [ apples ] consist more of air than water . . . ; others more of water than wind, as your costards and pomewaters. Muffett. [ 1913 Webster ]

2. The head; -- used contemptuously. [ 1913 Webster ]

Try whether your costard or my bat be the harder. Shak. [ 1913 Webster ]