Cos"ta (k?s"t?), n. [L., rib. See Coast.]
1. Anat.
A rib of an animal or a human being.
2. Bot.
A rib or vein of a leaf, especially the midrib.
3. Zool. (a)
The anterior rib in the wing of an insect.
(b)
One of the riblike longitudinal ridges on the exterior of many corals.
© Webster 1913.