The Collaborative International Dictionary of English v.0.48:

Grossification \Gross`i*fi*ca"tion\, n. [Gross + L. ficare (in
   comp.) to make. See -fy.]
   1. The act of making gross or thick, or the state of becoming
      so.
      [1913 Webster]

   2. (Bot.) The swelling of the ovary of plants after
      fertilization. Henslow.
      [1913 Webster]