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n. pl. phil·tra (-trə) or philtrums
1. In humans and certain other primates, the vertical indentation in the center of the upper lip.
2. In many other mammals, the cleft running through the center of the upper lip and often between the nostrils.

[New Latin, from Latin, philter, from Greek philtron, philter, charm, philtrum; see philter.]


n, pl philtra
(Anatomy) the indentation above the upper lip
[C17: from Latin, see philtre]


(ˈfɪl trəm)

n., pl. -tra (-trə).
1. the vertical groove on the surface of the upper lip, below the nose.
[1600–10; < Latin: love philter < Greek phíltron love philter, dimple in upper lip. See phil-, -tron]