Meaning ofcostain English

Noun

1. a riblike part (of plants, animals); midrib
   The costa is a main vein that runs down the center of a leaf.
2. a thickened vein (in insect wings)
   In insect wings, the costa is a thickened vein that provides structural support.
3. anatomy: a rib (or its equivalent)
   The costa is the main structural element of a bird's ribcage.