scutellum

noun5

1. •
   Any of several shield-shaped structures in insects, grasses etc
2. •
   A rounded apothecium having an elevated rim formed of the proper thallus, the fructification of certain lichens.
3. •
   The third of the four pieces forming the upper part of a thoracic segment of an insect. It follows the scutum, and is followed by the small postscutellum.
4. •
   One of the transverse scales on the tarsi and toes of birds.
5. •
   A grass seed cotyledon that is highly modified for absorption.