housemaid's knee
noun
: a swelling over the knee due to an enlargement of the bursa in the front of the patella
Word History
Etymology
from its occurrence among women who work a great deal on their knees
First Known Use
1824, in the meaning defined above
Medical Definition
housemaid's knee
noun
house·maid's knee ˈhau̇-ˌsmādz- 
: a swelling over the knee due to an enlargement of the bursa in the front of the patella