With preceding modifying word or numeral: having ribs of a specified kind, material, number, etc., or arranged in a certain way.

Anatomy and Zoology. Of or relating to a rib; articulating with, attached to, or associated with a rib; involving the ribs. Cf. costa, n.1 1.

Anatomy. Situated below a rib or beneath the ribs; lying on the under side of a rib, as a groove for an artery.

Situated behind a rib; (Entomology) designating the vein of an insect's wing immediately behind the costal vein.

Bearing a rib; articulating with a rib.

situated beneath the ribs, as in infracostal artery, infracostal muscles (New Sydenham Soc. Lexicon).

Pertaining to or connected with the xiphoid cartilage and the ribs.