Rostellum

Noun

1. A small beak-like process or extension; a small rostrum.

   "the rostellum of the stigma of violets, or of the operculum of many mosses"

2. A projecting part of the column in the flower of an orchid that separates the male stamen from the female gynoecium.
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.