epigynum

[ ih-pij-uh-nuhm ]

/ ɪˈpɪdʒ ə nəm /

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the chitinous plate in arachnids that covers the opening to the female genital tract.

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Also ep·i·gyne

[ep-i-jahyn]. /ˈɛp ɪˌdʒaɪn/.

1890–95; <New Latin, equivalent to epi-epi- + -gynum<Greek -gynon, neuter of -gynos;see -gynous

The epigynum of this form was extremely undeveloped, having only a small epigastric furrow with depressions at either end.
Journal of Entomology and Zoology, March 1917|Various
The book-lungs openings are found on the ventral surface of the first abdominal segment, as is also the epigynum.
Journal of Entomology and Zoology, March 1917|Various
The epigynum consists of a long epigastric furrow with a large lip-like opening near its median line.
Journal of Entomology and Zoology, March 1917|Various
Its size and markings are the same, and the epigynum is like that of longipes.
The Common Spiders of the United States|James Henry Emerton

The openings of the epigynum (fig. 273) are about their diameter apart.
The Common Spiders of the United States|James Henry Emerton