From ZooTerms (Dictionary of Invertebrate Zoology)
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mesanepisternum (noun; Greek mesos, middle; ana, up; epi, on; sternon, chest): (Arthropoda: Insecta) 1. In Diptera, the upper area of the mesepisternum separated from the meskatepisternum by the mesanapleural suture; sometimes divided into anterior and posterior by anepisternal cleft; the anepisternum. 2. In Odonata, the anepisternum.