To repeatedly distill a liquid by pouring the distillate back into the original material and distilling it again.
From Arabic 'cohobation,' a technique used by medieval alchemists. The term entered European languages through alchemical texts and scientific writings describing laboratory processes.
Medieval alchemists used cohobation trying to create the 'philosopher's stone,' and while they never succeeded at that, this repetitive distillation technique became foundational to modern chemistry and pharmacy.
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