Costa

[kɒstә]

(noun.) a riblike part of a plant or animal (such as a middle rib of a leaf or a thickened vein of an insect wing).

Checked by Alissa--From WordNet

(n.) A rib of an animal or a human being.

(n.) A rib or vein of a leaf, especially the midrib.

(n.) The anterior rib in the wing of an insect.

(n.) One of the riblike longitudinal ridges on the exterior of many corals.

Typist: Osborn

Checked by Genevieve