Opisthocoelian \O*pis`tho*coe"li*an\, Opisthocoelous
\O*pis`tho*coe"lous\, a. [Gr. 'o`pisqen behind + koi^los
hollow,] (Anat.)
Concave behind; -- applied especially to vertebrae in which
the anterior end of the centrum is convex and the posterior
concave.
[1913 Webster]