Definition of costate in English:

costate

Pronunciation /ˈkästāt/ /ˈkɑsteɪt/

adjective

Botany Zoology
  • Ribbed; possessing a costa.

    ‘Lateral slopes are weakly costate; the costae are diminished and almost invisible.’
    • ‘All are radially costate, with costae varying from simple and evenly distributed to variously branched and unevenly spaced.’
    • ‘Early genera were almost circular to elongate-oval, with smooth or finely costate shells.’
    • ‘In pioneer studies, the genus was confused with some spire-bearing brachiopods because of its strophic outline and costate ribbing.’
    • ‘The only other Eurasian finely and densely costate species known to me that is closely comparable is Leptochondria minima from the Lower Triassic of Russia.’

Origin

Early 19th century from Latin costatus, from costa ‘rib’.