ˌ ̷ ̷ ̷ ̷+ˈpijēəm noun
also hy·po·py·gid·i·um “+pəˈjidēəm
( plural hypopyg·ia also hypopygid·ia -ēə)
Etymology: New Latin, from hypo- + -pygium (from pyg- + -ium ) or -pygidium (from Greek pygidion small rump) — more at pygidium
: 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