Plural of cookery; multiple places where cooking is done, or multiple instances of the art and practice of cooking.
From 'cookery' (the practice and skill of cooking) plus the regular plural suffix '-ies.' The root 'cook' comes from Old English and ultimately from Latin 'coquere' meaning 'to cook.'
The word 'cookery' is actually older than 'cooking' as a general term—in older English texts, you'd read about 'the cookery of France' rather than 'French cooking,' showing how word preferences shift over centuries.
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