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The Collaborative International Dictionary
Spermathecae

Spermatheca \Sper`ma*the"ca\, n.; pl. Spermathec[ae]. [NL., from Gr. ???? seed + ???? case, or receptacle.] (Zo["o]l.) A small sac connected with the female reproductive organs of insects and many other invertebrates, serving to receive and retain the spermatozoa.

Wiktionary
spermathecae

n. (en-irregular plural of: spermatheca)