From ZooTerms (Dictionary of Invertebrate Zoology)
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mesosoma (noun; Greek mesos, middle; soma, body): 1. The middle part of an invertebrate's body.

2. (Arthropoda: Chelicerata) In Arachnida, the anterior portion of the abdomen, often clearly set off from the metasoma.

3. (Arthropoda: Insecta) For Hymenoptera, see alitrunk.

4. (Pogonophora) The short frenular region of the body.