The Collaborative International Dictionary
Pronotum
Pronotum \Pro*no"tum\, n.; pl. Pronota. [NL. See Pro-, and Notum.] (Zo["o]l.) The dorsal plate of the prothorax in insects. See Illust. of Coleoptera.
Wiktionary
pronotum
n. the dorsal plate of the prothorax in insects.