Definition of epigynum
: an external genital structure of a female spider consisting of a variably-shaped, hardened plate on the underside of the abdomen with typically one or two openings through which sperm is transferred from a male palpus
The epigynum of different spiders is highly variable in size and form, in ways that have little relation to general classification but are characteristic of species.— R. E. Snodgrass The projections on the male palp will fit only into the epigyne of a female of the same species.— Ken Preston-Mafham et al.
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Merriam-Webster unabridged
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Time Traveler for epigynum
The first known use of epigynum was in 1867
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