| the flat, movable bone at the front of the knee; the kneecap |
| the transparent anterior part of the external coat of the eye covering the iris and the pupil and continuous with the sclera |
philtrum phil·trum (fĭl'trəm)
n. pl. phil·tra (-trə)
The vertical indentation in the midline of the upper lip. Also called infranasal depression.