Costal cartilage. See Cartilage, and Illust. of Thorax.
Cos"tal-nerved` (k?s"tal-n?rvd`), a. (Bot.) Having the nerves spring from the midrib.
Cos"tard (k?s"t?rd), n. [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.] 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.