mesothorax

noun, plural mes·o·tho·rax·es, mes·o·tho·ra·ces [mez-uh–thawr–uh-seez, –thohr-, mes-, mee-zuh-, -suh-] /ˌmɛz əˈθɔr əˌsiz, -ˈθoʊr-, ˌmɛs-, ˌmi zə-, -sə-/.

1. the middle segment of the three divisions of the thorax of an insect, bearing the second pair of legs and the first pair of wings.

noun plural -raxes or -races (-rəˌsiːz)

1. the middle segment of the thorax of an insect, bearing the second pair of walking legs and the first pair of wingsSee also prothorax, metathorax