Definition of costa in English:


Syllabification: cos·ta
Pronunciation: /ˈkästə

noun (plural costae /-tē, -tī/)

Botany & Zoology
  • 1A rib, midrib, or riblike structure.
    More example sentences
    • It has strong divaricate ornamentation of coarse costae and/or small plicae, which bear low, close nodes, but which cover both the anterior and posterior faces of the shell.
    • The main part of the shell is coarsely commarginally lamellose and lacks radial costae.
    • The internal molds are smooth with exception of traces of the concentric costae on the rostral face.
  • 1.1 Entomology The main vein running along the leading edge of an insect’s wing.
    More example sentences
    • The forewings generally are reduced to the region immediately adjacent to the costa, having separated along the radius and cubitus veins.
    • It resulted in outgrowths and duplications of the costa region of the wing.


mid 19th century: from Latin.

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