endostome

from The Collaborative International Dictionary of English v.0.48

Endostome \En"do*stome\, n. [See {Endostoma}.]
   1. (Bot.) The foramen or passage through the inner integument
      of an ovule.
      [1913 Webster]

   2. (Zo["o]l.) And endostoma.
      [1913 Webster]