platycoelian

from The Collaborative International Dictionary of English v.0.48
Platycoelian \Plat`y*c[oe]"li*an\, a. [Platy + Gr. ? hollow.]
   (Anat.)
   Flat at the anterior and concave at the posterior end; --
   said of the centra of the vertebr[ae] of some extinct
   dinouaurs.
   [1913 Webster]
    

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