‖Mes′o‐ster″num (?), n. [Meso- + sternum.]
1. (Anat.) The middle portion, or body, of the sternum.
2. (Zoöl.) The ventral piece of the middle segment of the thorax in insects.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.