spadix

from WordNet (r) 3.0 (2006)

spadix
    n 1: the fleshy axis of a spike often surrounded by a spathe

from The Collaborative International Dictionary of English v.0.48

Spadix \Spa"dix\, n.; pl. L. {Spadices}, E. {Spadixes}. [L., a
   palm branch broken off, with its fruit, Gr. ?.]
   1. (Bot.) A fleshy spike of flowers, usually inclosed in a
      leaf called a spathe.
      [1913 Webster]

   2. (Zool.) A special organ of the nautilus, due to a
      modification of the posterior tentacles.
      [1913 Webster]