Entry 2 senses Webster, 1913

Costal

/(k?s"tal)/ · Cos·tal · IPA /ˈkɑstl̩/

01 a. Pertaining to the ribs or the sides of the body; as, costal nerves.

1.
Pertaining to the ribs or the sides of the body; as, costal nerves.(Anat.)
2.
Relating to a costa, or rib.(Bot. & Zool.)

Phrases & compounds

Costal cartilage — See Cartilage, and Illust. of Thorax.