What is "episternum"

Episternum \Ep`i*ster"num\, n.; pl. Episterna. [NL. See Epi-, and Sternum.]

1. (Anat.)

   1. A median bone connected with the sternum, in many vertebrates; the interclavicle.

   2. Same as Epiplastron.

2. (Zo["o]l.) One of the lateral pieces next to the sternum in the thorax of insects.

n. (context anatomy English) The upper segment of the sternum