noun, plural prosterna [proh-stur-nuh] , prosternums.
the ventral sclerite of the prothorax of an insect.

1820–30; < Neo-Latin; see pro-1, sternum

prosternal, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
prosternum (prəʊˈstɜːnəm)
n , pl -na, -nums
the sternum of the prothorax of an insect

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
In adults at rest, the cylindrical beak curves back into the prosternum.
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