• Webster's Revised Unabridged Dictionary
    • a Mesosternal (Anat) Of or pertaining to the mesosternum.
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Century Dictionary and Cyclopedia
    • mesosternal Of or pertaining to the mesosternum: as, a mesosternal sternite.
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In literature:

Mesosternal cavity: in Elateridae, the opening into which the prosternal spine or mucro is fitted.
"Explanation of Terms Used in Entomology" by John. B. Smith
Prosoma as in the Mygalomorphae, except that the mesosternal area is long and narrow.
"Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3" by Various