The Collaborative International Dictionary
Mesonotum
Mesonotum \Mes`o*no"tum\, n. [NL., fr. Gr. me`sos middle + nw^ton the back.] (Zo["o]l.) The dorsal portion of the mesothorax of insects.
Wiktionary
mesonotum
n. (context zoology English) The dorsal portion of the mesothorax of insects.