Platycoelian
Pronunciation : Plat`y*coe"li*an
Part of Speech : a.
Etymology : [Platy + Gr. (Anat.)
Definition : Defn: Flat at the anterior and concave at the posterior end; -- said of the centra of the vertebr? of some extinct dinouaurs.
Source : Webster's Unabridged Dictionary, 1913