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单词 pygidium
释义 py·gid·i·um
\pīˈjidēəm\ noun
(plural pygid·ia \-ēə\)
Etymology: New Latin, from Greek pygidion small rump, from pygē rump + -idion -idium
: a caudal structure or the terminal body region of various invertebrates: as
 a. : the caudal plate of a trilobite
 b. : the terminal tergite of an insect's abdomen
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