A nursemaid or nursery maid, is mostly a historical term of employment for a female servant in an elite household. In the 21st century, the position is largely defunct, owing to the relatively small number of households who maintain large staffs with the traditional hierarchy. The nursery maid reported to the nurse (what now often is called a nanny) and assisted her in taking care of the children of the employer's family.
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nursemaid A woman who watches over someone else's kids usually as a full-time job.