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The Collaborative International Dictionary
Epicleidium

Epicleidium \Ep`i*clei"di*um\, n. [NL., fr. Gr. 'epi` upon + ? a little key.] (Anat.) A projection, formed by a separate ossification, at the scapular end of the clavicle of many birds.

Wiktionary
epicleidium

n. (context anatomy English) A projection, formed by a separate ossification, at the scapular end of the clavicle of many birds.