Definition of Chelonia in US English:

Chelonia

plural noun

Zoology
  • former term for Testudines
    • ‘The Norian age was remarkable for the appearance of the Chelonia which seem to have emerged out of nowhere.’
    • ‘If reincarnated, I will never come back as a marine turtle - certainly not one of the edible varieties, the green turtle Chelonia mydas, for example.’
    • ‘This suggests that turtles, all now classified in the reptile order Chelonia, were originally created in at least two separate basic kinds.’
    • ‘More pages on Chelonia are planned for the near future.’
    • ‘Six extinct genera, as well as the extant genera Caretta and Chelonia, date from the Upper Cretaceous of Europe and North America.’

Origin

Modern Latin (plural), from Greek khelōnē ‘tortoise’.

Pronunciation

Chelonia

/kəˈlōnēə/