Defn: A rib or vein of a leaf, especially the midrib.
3. (Zoöl.) (a) The anterior rib in the wing of an insect. (b) One of the riblike longitudinal ridges on the exterior of many corals.
COSTAGE
Cost"age (kst"j; 115), n. Etym: [OF. coustage.]
Defn: Expense; cost. [Obs.] Chaucer.
COSTAL
Cos"tal (ks"tal), a. Etym: [Cf. F. costal. See Costa.]
1. (Anat.)
Defn: Pertaining to the ribs or the sides of the body; as, costal nerves.
2. (Bot. & Zoöl.)
Defn: Relating to a costa, or rib. Costal cartilage. See Cartilage, and Illust. of Thorax.
COSTAL-NERVED
Cos"tal-nerved` (ks"tal-nrvd`), a. (Bot.)