The Collaborative International Dictionary of English v.0.48:

Reabsorb \Re`ab*sorb"\ (r[=e]`[a^]b*s[^o]rb"), v. t.
   To absorb again; to draw in, or imbibe, again what has been
   effused, extravasated, or thrown off; to swallow up again;
   as, to reabsorb chyle, lymph, etc.; -- used esp. of fluids.
   [1913 Webster]

WordNet (r) 3.0 (2006):

reabsorb
    v 1: undergo resorption [syn: reabsorb, resorb]