Definition of hypopygium
: a modified 9th abdominal segment of many insects with which the copulatory apparatus is associated; especially : such a modified segment together with the copulatory apparatus of a dipterous insect
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Origin and Etymology of hypopygium
New Latin, from hypo- + -pygium (from pyg- + -ium) or -pygidium (from Greek pygidion small rump) — more at pygidium
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