• Webster's Revised Unabridged Dictionary
    • a Metasternal Of or pertaining to the metasternum.
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Century Dictionary and Cyclopedia
    • metasternal In entomology, metathoracic and sternal or ventral, as a sclerite of an insect's thorax; of or pertaining to the metasternum
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In literature:

Metasternal epimera: small sclerite separating the metasternal episterna from the ventral segments.
"Explanation of Terms Used in Entomology" by John. B. Smith
Its ventral surface provided with one prosternal, two mesosternal and one metasternal plate.
"Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3" by Various