pygidium

noun py·gid·i·um \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

New Latin, from Greek pygidion, diminutive of pygē rump

First Known Use: 1848

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