the center of the three divisions of thorax of an insect, bearing the center set of feet and also the first set of wings.
the midst of the 3 sections regarding the thorax of an insect
The middle part regarding the thorax in bugs. See Illust. of coleoptera.
In entomology, the second or middle one of the three divisions associated with thorax, situated amongst the prothorax and the metathorax, and bearing the second set of legs additionally the first set of wings. When large, like in dipterous insects, it's simply known as the thorax.