Jisho

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Noun, Suru verb
1. tempering; annealing
Wikipedia definition
2. TemperingTempering is a process of heat treating, which is used to increase the toughness of iron-based alloys. It is also a technique used to increase the toughness of glass. For metals, tempering is usually performed after hardening, to reduce some of the excess hardness, and is done by heating the metal to a much lower temperature than was used for hardening.
Read “Tempering” on English Wikipedia
Read “焼き戻し” on Japanese Wikipedia
Read “Tempering” on DBpedia
Other forms
焼戻し 【やきもどし】

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