-ons
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. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

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