n. [Gr. meta, after; pleuron, side](ARTHROPODA: Insecta)In Hymenoptera Ichneumonidae, ordinarily divided into two parts, the lower is largest and generally referred to; the lower part an oval or subtriangular area on the side of the thorax, between middle and hind coxae to the propodeum; the upper area lies behind the upper half of the mesepimeron and below and behind the base of the hind wing, separated from the propodeum by a suture.
Online Dictionary of Invertebrate Zoology. A.R. Maggenti and S.L. Gardne. 2005.