The Collaborative International Dictionary
Mesoscutum
Mesoscutum \Mes`o*scu"tum\, n. [Meso- + scutum.] (Zo["o]l.) The scutum or dorsal plate of the middle thoracic segment of an insect. See Illust. of Butterfly.
Wiktionary
mesoscutum
n. (context zoology English) The scutum or dorsal plate of the middle thoracic segment of an insect.