The Collaborative International Dictionary of English v.0.48:

azotemia \azotemia\ n. (Med.)
   the accumulation of an abnormally large amount of
   nitrogen-containing waste products, such as urea, in the
   blood; uremia.
   [PJC]

WordNet (r) 3.0 (2006):

azotemia
    n 1: accumulation in the blood of nitrogenous waste products
         (urea) that are usually excreted in the urine [syn:
         uremia, uraemia, azotemia, azotaemia]