Meaning

noun hinge joint in the human leg connecting the tibia and fibula with the femur and protected in front by the patella

noun joint between the femur and tibia in a quadruped; corresponds to the human knee

noun the part of a trouser leg that provides the cloth covering for the knee

originEtymology tree Proto-Indo-European *ǵnéw-der. Proto-Indo-European *ǵnéwom Proto-Germanic *knewą Proto-West Germanic *kneu Old English cnēo Middle English kne English knee Inherited from Middle English kne, from Old English cnēow, from Proto-West Germanic *kneu, from Proto-Germanic *knewą, from Proto-Indo-European *ǵnéw-o-m, a thematic derivative of *ǵónu. See also West Frisian knibbel, Low German…

Etymology from Wiktionary, CC BY-SA 3.0