noun
Etymology: so called from its frequent occurrence among servant girls who work a great deal on their knees
: a swelling over the knee due to an enlargement of the bursa in the front of the patella
noun
Etymology: so called from its frequent occurrence among servant girls who work a great deal on their knees
: a swelling over the knee due to an enlargement of the bursa in the front of the patella
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012