The Collaborative International Dictionary of English v.0.48:

Reabsorption \Re`ab*sorp"tion\ (r[=e]`[a^]b*s[^o]rp"sh[u^]n), n.
   The act or process of reabsorbing.
   [1913 Webster]

WordNet (r) 3.0 (2006):

reabsorption
    n 1: the organic process in which the substance of some
         differentiated structure that has been produced by the body
         undergoes lysis and assimilation [syn: resorption,
         reabsorption]