rostellum

noun3

1. •
   A small beak-like process or extension; a small rostrum.
2. •
   A projecting part of the column in the flower of an orchid that separates the male stamen from the female gynoecium.

   • In many orchids there is a discrete "viscidium," or sticky pad, formed by the rostellum. — 1993
3. •
   A retractable protruding part at the anterior end of a soft-bodied tapeworm; the scolex from which it protrudes is often armed with hooks which serve to keep it in place attached to the host.

   • The scolex exhibits a retractable rostellum with crowns of recurved thorn-like hooks and four cup-like suckers. — 2008