• Webster's Revised Unabridged Dictionary
    • n Prosternum (Zoöl) The ventral plate of the prothorax of an insect.
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Century Dictionary and Cyclopedia
    • n prosternum In entomology, the ventral or sternal sclerite of the prothorax; the under side of the prothoracic somite; the middle piece of the antepectus. Also præsternum.
    • n prosternum [capitalized] A genus of coleopterous insects. Also Prosternon.
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Webster's Revised Unabridged Dictionary
NL. See Pro- and Sternum


In literature:

Ante-furca: an internal forked process from the prosternum, to which muscles are attached.
"Explanation of Terms Used in Entomology" by John. B. Smith
Prosternum underlying the proboscis.
"Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3" by Various