Hypertext Webster Gateway: "mesosternum"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Mesosternum \Mes`o*ster"num\, n. [Meso- + sternum.]
1. (Anat.) The middle portion, or body, of the sternum.
2. (Zo["o]l.) The ventral piece of the middle segment of the
thorax in insects.
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