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pygidium

py·gid·i·um [ pī jíddee əm ] (plural py·gid·i·a [ pī jíddee ə ])


noun 
Definition:
 
1. hindmost part of invertebrate: the hindmost part of the body in some insects, worms, and other invertebrates

2. covering for part of invertebrate abdomen: a protective covering of the anal portion of the abdomen of some invertebrates

[Mid-19th century. < Greek puge "rump"]

py·gid·i·al adjective
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