Source : Webster's Revised Unabridged Dictionary (1913)

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.