cupule

from WordNet (r) 3.0 (2006)

cupule
    n 1: cup-shaped structure of hardened bracts at the base of an
         acorn [syn: {cupule}, {acorn cup}]
    2: a sucker on the feet of certain flies

from The Collaborative International Dictionary of English v.0.48

Cupule \Cu"pule\ (k?"p?l), n. [See {Cupola}.]
   1. (Bot.) A cuplet or little cup, as of the acorn; the husk
      or bur of the filbert, chestnut, etc.
      [1913 Webster]

   2. (Zool.) A sucker or acetabulum.
      [1913 Webster]