Hysteresis: a retardation of the effect when the forces acting upon a body are changed (as if from viscosity or internal friction); esp: a lagging in the values of resulting magnetization in a magnetic material (as iron) due to a changing magnetizing force.
Lacey, Kim. "kirschenbaum’s mechanisms". QuEst. Word Press. 21 Nov. 2008. Web. 12 Apr. 2015. <https://qualquest.wordpress.com/2008/11/21/kirschenbaums-mechanisms/>.
Hysteresis: a retardation of the effect when the forces acting upon a body are changed (as if from viscosity or internal friction); esp: a lagging in the values of resulting magnetization in a magnetic material (as iron) due to a changing magnetizing force.
Sethna, Jim. "What's Hysteresis". Cornell Laboratory of Atomic and Solid State Physics. 30 June 1994. Web. 12 Apr. 2015. <http://www.lassp.cornell.edu/sethna/hysteresis/WhatIsHysteresis.html>.
– Frank