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The Collaborative International Dictionary of English v.0.48:

Prescutum \Pre*scu"tum\, n.; pl. Prescuta. [NL. See Pr[ae]-, and Scutum.] (Zool.) 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. [1913 Webster]