To subject a liquid to repeated distillation by pouring the distillate back onto the remaining material.
From the noun 'cohobation,' derived from Arabic 'al-cohob' (redistillation). The verb form became common in alchemical and chemical texts of the 16th-18th centuries.
Alchemists would cohobate liquids dozens of times, believing that each cycle brought them closer to perfection—a process that mirrors modern scientific thinking about refinement and purification.
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