hysteresis noun. [hɪstǝ'ri:sɪs] Pl. -reses [-'ri:si:z]. L19.
[Greek husterēsis short-coming, deficiency, from husterein be behind, come late, from husteros late.]
The phenomenon whereby changes in some property of a physical system lag behind changes in the phenomenon causing it, esp. the lag of magnetization behind magnetizing force when the latter is varying; any dependence of the value of a property on the past history of the system.

Comb.:
hysteresis curve, hysteresis loop: showing how a property varies when the phenomenon causing it varies from one value to another and back again; hysteresis loss the energy dissipated as heat in a system as a result of hysteresis.

■ hysteresial adjective L19.

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