To cook or heat thoroughly; to prepare something by cooking or heating until it's fully done.
From Latin 'excoquere' (to cook thoroughly), composed of 'ex-' (thoroughly) + 'coquere' (to cook). This word dates to early English usage but is now extremely rare.
This ancient cooking term 'excoct' survives mostly in medical and alchemical texts, where it described heating substances to transform them—it's a reminder that cooking was once seen as a kind of transformation or alchemy.
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