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.