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Pronunciation: his'ter-e'sis


  1. Failure of either one of two related phenomena to keep pace with the other; or any situation in which the value of one depends on whether the other has been increasing or decreasing.
  2. The lag of a magnetic effect behind its cause.
  3. The temperature differential that exists when a substance, such as reversible hydrocolloid, melts at one temperature and solidifies at another.
  4. The basis of a type of cooperativity observed in many enzyme-catalyzed reactions in which the degree of cooperativity is associated with a slow conformational change of the enzyme.
  5. The nonlinear nature of the pressure-volume curve of the lung in which transpulmonary pressure at a given volume during inflation is less than the transpulmonary pressure at the same volume during exhalation.

Synonym(s): magnetic inertia

[G. hysteresis, a coming later]

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