rostellum

Tanımlar (İngilizce)

1. isim 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. isim 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.”

3. isim 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 morphology of the scolex, particularly the rostellum, is also useful in diagnosis; T.^([Taenia]) saginata has no rostellum and its scolex bears no hooks, making it easily distinguishable from T. solium, which has an armed rostellum.”