amphicœlous

Century Dictionary and Cyclopedia

1. In anatomy and zoology, hollowed at both ends: said of vertebræ the centra or bodies of which are biconcave. This is the usual character of the vertebræ of fishes, and also of the extinct crocodiles (Teleosauridæ, Belodontidæ), and of some birds of the Cretaceous period, as of the genus Ichthyornis (Odontotormæ).