Source : Webster's Revised Unabridged Dictionary (1913)

Pleurosteon \Pleu*ros"te*on\, n.; pl. L. {Pleurostea}, E.
   {-ons}. [NL., fr. Gr. ? a rib + ? a bone.] (Anat.)
   The antero-lateral piece which articulates the sternum of
   birds.