The Collaborative International Dictionary of English v.0.48:

Scyphus \Scy"phus\, n.; pl. Scyphi. [L., a cup, Gr. sky`fos.]
   1. (Antiq.) A kind of large drinking cup, -- used by Greeks
      and Romans, esp. by poor folk.
      [1913 Webster]

   2. (Bot.)
      (a) The cup of a narcissus, or a similar appendage to the
          corolla in other flowers.
      (b) A cup-shaped stem or podetium in lichens. Also called
          scypha. See Illust. of Cladonia pyxidata, under
          Lichen.
          [1913 Webster]