hypopygium

noun
hy·po·pyg·i·um
variants: or less commonly hypopygidium \"+pəˈjidēəm \
plural hypopygia also hypopygidia\-ēə \

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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History and Etymology for hypopygium

New Latin, from hypo- + -pygium (from pyg- + -ium) or -pygidium (from Greek pygidion small rump)

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