hypopygium
noun
hy·po·pyg·i·um
variants:
or less commonly hypopygidium \ "+pəˈjidēəm \
plural hypopygia
also hypopygidia\ -Ä“É™ \
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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