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The Collaborative International Dictionary of English v.0.48 (gcide)

Housemaid \House"maid`\, n.
A female servant employed to do housework, esp. to take care
of the rooms.
[1913 Webster]

{Housemaid's knee} (Med.), a swelling over the knee, due to
an enlargement of the bursa in the front of the kneepan;
-- so called because frequently occurring in servant girls
who work upon their knees.
[1913 Webster]