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The Collaborative International Dictionary
Pleurostea

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.

Wiktionary
pleurostea

n. (plural of pleurosteon English)