gonocyst

noun2

1. •
   A membrane around the spermatogonia in the male gonads.

   • The spermatogonia continue to reside in the gonocyst and form spermatocyte, which begins to increase in size. — 2013
2. •
   An expansion of the zoarium in which multiple embryos develop.

   • Ovicell in the form of a pyramidal hemispherical sac ( gonocyst ) with a terminal oeciostome, formed on the coalesced distal cells, Axis of the ovicell parallel to the axis of the cells. — 1972