Entry 1 sense Webster, 1913

Metathorax

/mĕtˌ-əth-ôr'-ăksˌ/ · Met·a·tho·rax · IPA /mˌɛtəθˈɔrˌæks/

01 n. The last or posterior segment of the thorax in insects. See Illust. of Coleoptera.

1.
The last or posterior segment of the thorax in insects. See Illust. of Coleoptera.(Zool.) See: Coleoptera