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| a prominent oval mass of lymphoid tissue on each side of the throat |
| either one of the second pair of cranial nerves, consisting of sensory fibers that conduct impulses from the retina to the brain |
philtrum phil·trum (fĭl'trəm)
n. pl. phil·tra (-trə)
The vertical indentation in the midline of the upper lip. Also called infranasal depression.