One of the mysteries of the English language finally explained.
In certain insects: a region of the ventral part of the metathorax, just in front of the coxae of the posterior legs.
Early 19th century; earliest use found in William Kirby (1759–1850), entomologist and naturalist. From meso- + ancient Greek στῆθος chest + -ium. Compare ancient Greek στηθίον little breast.
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