The Collaborative International Dictionary of English v.0.48:

Fasciculus \Fas*cic"u*lus\, n.; pl. Fasciculi. [L. See
   Fascicle.]
   1. A little bundle; a fascicle.
      [1913 Webster]

   2. A division of a book.
      [1913 Webster]

WordNet (r) 3.0 (2006):

fasciculus
    n 1: a bundle of fibers (especially nerve fibers) [syn: fiber
         bundle, fibre bundle, fascicle, fasciculus]