The Collaborative International Dictionary
Metosteon
Metosteon \Me*tos"te*on\, n. [NL., fr. Gr. ? after + ? bone.] (Anat.) The postero-lateral ossification in the sternum of birds; also, the part resulting from such ossification.
Wiktionary
metosteon
n. 1 (context anatomy English) The posterolateral ossification in the sternum of birds. 2 (context anatomy English) The part resulting from such ossification.