Pelta

from The Collaborative International Dictionary of English v.0.48

Pelta \Pel"ta\, n.; pl. {Pelt[ae]}. [L., a shield, fr. Gr.
   pe`lth.]
   1. (Antiq.) A small shield, especially one of an
      approximately elliptic form, or crescent-shaped.
      [1913 Webster]

   2. (Bot.) A flat apothecium having no rim.
      [1913 Webster] Peltate