knee + pan
kneepan (plural kneepans)
- The kneecap; the patella.
1851, Herman Melville, Moby Dick, Chapter 11:
- by little and little we found ourselves sitting up; the clothes well tucked around us, leaning against the head-board with our four knees drawn up close together, and our two noses bending over them, as if our kneepans were warming-pans.