COSTARD

costard. Costard, n. a head, blockhead, kind of large apple

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Cos″tard (k?s″t?rd), 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. 1. An apple, large and round like the head.
Some consist more of air than water . . . ; others more of water than wind, as your costards and pomewaters. Muffett. 2. 2. The head; — used contemptuously.
Try whether your costard or my bat be the harder. Shak.