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The Collaborative International Dictionary
Prescutum

Prescutum \Pre*scu"tum\, n.; pl. Prescuta. [NL. See Pr[ae]-, and Scutum.] (Zo["o]l.) The first of the four pieces composing the dorsal part, or tergum, of a thoracic segment of an insect. It is usually small and inconspicuous.

Wiktionary
prescutum

n. (context zoology English) The first of the four pieces composing the dorsal part, or tergum, of a thoracic segment of an insect.