The Collaborative International Dictionary of English v.0.48:

Cachexia \Ca*chex"i*a\, Cachexy \Ca*chex"y\, n. [L. cachexia,
   Gr. kachexi`a; kako`s bad + "e`xis condition.]
   A condition of ill health and impairment of nutrition due to
   impoverishment of the blood, esp. when caused by a specific
   morbid process (as cancer or tubercle).
   [1913 Webster]

WordNet (r) 3.0 (2006):

cachexy
    n 1: any general reduction in vitality and strength of body and
         mind resulting from a debilitating chronic disease [syn:
         cachexia, cachexy, wasting]