pleurocentrum

from The Collaborative International Dictionary of English v.0.48

Pleurocentrum \Pleu`ro*cen"trum\, n. [NL. see {Pleuro-}, and
   {Centrum}.] (Anat.)
   One of the lateral elements in the centra of the vertebr[ae]
   in some fossil batrachians.
   [1913 Webster]