opisthocoelous adjective1 •concave behind; applied especially to vertebrae in which the anterior end of the centrum is convex and the posterior concaveSpecimen 1912VIII64 was opisthocoelous, pleurocoelous, and caudally wider than tall, as in Epachthosaurus and Pellegrinisaurus (15), and may pertain to Paralititan. — 2001
