One of the mysteries of the English language finally explained.
1A rib, midrib, or riblike structure.
- ‘Wall thickness is 10-26 m, becoming thicker at the corners of the chamber where it may bulge outwardly to produce coarse longitudinal costae.’
- ‘He differentiated his new species from S. robusta by its more numerous costae on the shell flanks.’
- ‘The main part of the shell is coarsely commarginally lamellose and lacks radial costae.’
- ‘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 internal molds are smooth with exception of traces of the concentric costae on the rostral face.’
- 1.1Entomology The main vein running along the leading edge of an insect's wing.
- ‘It resulted in outgrowths and duplications of the costa region of the wing.’
- ‘The forewings generally are reduced to the region immediately adjacent to the costa, having separated along the radius and cubitus veins.’
Mid 19th century: from Latin.
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