asthenia

from WordNet (r) 3.0 (2006)

asthenia
    n 1: an abnormal loss of strength [syn: {asthenia}, {astheny}]

from The Collaborative International Dictionary of English v.0.48

Asthenia \As`the*ni"a\, Astheny \As"the*ny\, n. [NL. asthenia,
   Gr. 'asqe`nia; 'a priv. + sqe`nos strength.] (Med.)
   Want or loss of strength; debility; diminution of the vital
   forces.
   [1913 Webster]