The Collaborative International Dictionary of English v.0.48:

Follicle \Fol"li*cle\, n. [L. folliculus a small bag, husk, pod,
   dim of follis bellows, an inflated ball, a leathern money
   bag, perh. akin to E. bellows: cf. F. follicule. Cf. 2d
   Fool.]
   1. (Bot.) A simple podlike pericarp which contains several
      seeds and opens along the inner or ventral suture, as in
      the peony, larkspur and milkweed.
      [1913 Webster]

   2. (Anat.)
      (a) A small cavity, tubular depression, or sac; as, a hair
          follicle.
      (b) A simple gland or glandular cavity; a crypt.
      (c) A small mass of adenoid tissue; as, a lymphatic
          follicle.
          [1913 Webster]

WordNet (r) 3.0 (2006):

follicle
    n 1: any small spherical group of cells containing a cavity