noun, plural spermathecae [spur-muh-thee-see] . Zoology.
a small sac or cavity in female or hermaphroditic invertebrates used to store sperm for fertilizing eggs, as in the queen bee.

1820–30; sperma- (variant of spermato-, spermo-) + theca

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World English Dictionary
spermatheca (ˌspɜːməˈθiːkə)
a sac or cavity within the body of many female invertebrates, esp insects, used for storing spermatozoa before fertilization takes place
[C19: see sperm1, theca]

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American Heritage
Science Dictionary
spermatheca   (spûr'mə-thē'kə)  Pronunciation Key 
Plural spermathecae (spûr'mə-thē'sē)
A receptacle in the reproductive tracts of certain female invertebrates, especially insects, in which spermatozoa are received and stored until needed to fertilize the ova.
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