cribellum

noun1

1. •
   A spinning organ having many fine pores, situated in front of the spinners in some araneomorph spiders.

   • 1996: some groups of spiders have a sieve-like plate, the cribellum, just in front of the spinners. — Michael J. Roberts, Spiders of Britain and Northern Europe (Collins 1996, p. 17) — 1996