Costard
Pronunciation : Cos"tard (ks"trd)
Part of Speech : n.
Etymology : [Prob. fr. OF. coste rib, side, F. c?te, and meaning orig., a ribbed apple, from the ribs or angles on its sides. See Coast.]
Definition : 1. An apple, large and round like the head. Some [apples] consist more of air than water . . . ; others more of water than wind, as your costards and pomewaters. Muffett.
2. The head; -- used contemptuously. Try whether your costard or my bat be the harder. Shak.
Source : Webster's Unabridged Dictionary, 1913