cos·tal /ˈkɑstḷ/ 形容詞
  肋骨狀的,具肋的,具前緣脈的
  Cos·tal a.
  1. Anat. Pertaining to the ribs or the sides of the body; as, costal nerves.
  2. Bot. & Zool. Relating to a costa, or rib.
  Costal cartilage. See Cartilage, and Illust. of Thorax.
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  costal
       adj : of or relating to or near a rib