The Collaborative International Dictionary of English v.0.48:

Athrepsia \A*threp"si*a\, n. [NL., fr. Gr. ? priv. + ?
   nourishment.] (Med.)
   Profound debility of children due to lack of food and to
   unhygienic surroundings. -- A*threp"tic, a.
   [Webster 1913 Suppl.]