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From New Latin anergia, from Greek an- ("not"; "without") + ergon ("work").


anergy (countable and uncountable, plural anergies)

  1. (physics) Dilute or disorganized energy, which cannot be transformed into work.
    • The maximum fraction of an energy form which (in a reversible process) can be transformed into work is called exergy. The remaining part is called anergy, and this corresponds to the waste heat.[1]
    • To be useful, internal energy has to be concentrated. The more dilute or disorganized the internal energy, the less useful it is ...[2]
  2. (pathology) Deficiency of energy.
  3. (immunology) Lack of immunity to an antigen.

Related terms[edit]


  1. ^ Honerkamp, J. ♦ Statistical Physics ♦ Springer, 2002, p. 298
  2. ^ Newman, Jay ♦ Physics of the Life Sciences ♦ Springer, 2008, p. 336