noun \pī-ˈji-dē-əm\
plural -gid·ia \-ˈji-dē-ə\

Definition of PYGIDIUM

:  a caudal structure or the terminal body region of various invertebrates
py·gid·i·al \-dē-əl\ adjective

Origin of PYGIDIUM

New Latin, from Greek pygidion, diminutive of pygē rump
First Known Use: 1848


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