From ZooTerms (Dictionary of Invertebrate Zoology)
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metapleurum (noun; Greek 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.