'Housemaid's knee' definitions:

Definition of 'housemaid's knee'

From: WordNet
noun
Swelling of the bursa in the knee (due to trauma or excessive kneeling)

Definition of 'Housemaid's knee'

From: 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]