sper·ma·the·ca 
(spûr′mə-thēkə)
(spûr′mə-thēkə)n. pl. sper·ma·the·cae (-sē)
A receptacle in the reproductive tract of many female or hermaphrodite invertebrates and certain female vertebrates, in which spermatozoa are received and stored until needed to fertilize the ova.
[Late Latin sperma, semen; see SPERM1 + THECA.]
sper′ma·thecal adj.