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What is the definition of "eutectoid"?

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According to Dictionary.com, "eutectoid" is a noun defined as "a mixture of substances similar to a eutectic, but forming two or three constituents from a solid instead of from a melt." As an adjective, the term refers to substances concerned with or suitable for eutectoid mixtures.

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About.com describes "eutectoid" as a mixture of two or more constituents which forms on cooling from a solid solution and transforms on heating at a constant minimum temperature. For example, eutectoid steel contains approximately 0.83 percent carbon. The term "eutectoid" derives from the Greek word "e��t?kt" in the late 1800s, which means easily melted or dissolved.

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