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In the hierarchy of a great house, the kitchen maid ranked below a cook and above a scullery maid. An experienced kitchen maid is an assistant cook; the position may be compared to that of a chef de partie in a professional kitchen.
An early meaning of "slut" was "kitchen maid or drudge" (c. 1450), a meaning retained as late as the 18th century.
In the 19th century a colloquial version was "kitching-maid".