The Collaborative International Dictionary of English v.0.48:

Cartilaginification \Car`ti*la*gin`i*fi*ca"tion\, n. [L.
   cartilago, -laginis, cartilage + facere to make.]
   The act or process of forming cartilage. --Wright.
   [1913 Webster]

WordNet (r) 3.0 (2006):

cartilaginification
    n 1: abnormal formation of cartilage from other tissues;
         observed in some Asians