One of the mysteries of the English language finally explained.
The middle section of the body in various invertebrates that have a body divided into three distinct sections (e.g. hemichordates, lophophorates, insects, etc.).
Late 19th century; earliest use found in Thomas Huxley (1825–1895), biologist and science educationist. From meso- + ancient Greek σῶμα body, after metasoma and prosoma.
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