The Collaborative International Dictionary of English v.0.48:

Valetudinarianism \Val`e*tu`di*na"ri*an*ism\, n.
   The condition of a valetudinarian; a state of feeble health;
   infirmity.
   [1913 Webster]

WordNet (r) 3.0 (2006):

valetudinarianism
    n 1: the state of being weak in health or body (especially from
         old age) [syn: infirmity, frailty, debility,
         feebleness, frailness, valetudinarianism]