The Collaborative International Dictionary of English v.0.48:

anasarca \an`a*sar"ca\ ([a^]n`[.a]*s[aum]r"k[.a]), n. [NL., from
   Gr. 'ana` throughout + sa`rx, sarko`s, flesh.] (Med.)
   Severe generalized edema.
   [1913 Webster + AS]

WordNet (r) 3.0 (2006):

anasarca
    n 1: generalized edema with accumulation of serum in
         subcutaneous connective tissue