American Heritage Dictionary
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Century Dictionary
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GNU Webster's 1913
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200° or more above the upper critical, cooling in air down through the recalescence point, then reheating it to just above the critical point and again cooling slowly through the recalescence, then quenching in oil.— The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel

American Heritage Dictionary (1)
Century Dictionary (1)
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