The Collaborative International Dictionary of English v.0.48:

Radication \Rad`i*ca"tion\ (r[a^]d"[i^]*k[=a]"sh[u^]n), n. [Cf.
   F. radication.]
   1. The process of taking root, or state of being rooted; as,
      the radication of habits.
      [1913 Webster]

   2. (Bot.) The disposition of the roots of a plant.
      [1913 Webster]