Curie point

n.
A transition temperature marking a change in the magnetic or ferroelectric properties of a substance, especially the change from ferromagnetism to paramagnetism. Also called Curie temperature.

[After Pierre CURIE.]

The temperature at which the molecules of a material can be altered when subjected to a magnetic field. In optical material, it is approximately 200 degrees Celsius. See magneto-optic disk.

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The noun has one meaning:

Meaning #1: the temperature above which a ferromagnetic substance loses its ferromagnetism
  Synonym: Curie temperature

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