Meaning of rostellum

ros•tel•lum

Pronunciation: (ro-stel'um), [key]
— pl. ros•tel•la
  1. any small, beaklike process.
  2. a beaklike modification of the stigma in many orchids.
    1. a projecting part of the scolex in certain tapeworms.
    2. a part of the mouth in many insects, designed for sucking.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.