From ZooTerms (Dictionary of Invertebrate Zoology)
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mesadenia (noun, plural; singular mesadene; Greek mesos, middle; aden, gland): (Arthropoda: Insecta) 1. Mesodermal accessory glands of male genitalia. 2. In some male Heteroptera, paired, highly coiled tubules that run side by side to enter anteriorly the bulbus ejaculatorius or closely associated with the short vasa deferentia.