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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]
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References in periodicals archive ?
Other features include progressive myopia, retinal dystrophy, joint hypermobility, and distinctive facial features: thick hair and eyebrows, long eyelashes, unusually-shaped eyes (down-slanting and waveshaped), a bulbous nasal tip, short philtrum, and prominent upper central teeth.
This was a really rare Sasha without a philtrum - the crease that joins the lower part of nose to the top lip," said Mr Anderson.
Baby Hamish arrived with a thin upper lip and flattened philtrum, the area between the nose and mouth commonly affected by foetal alcohol syndrome.
Moving down to the mouth, with the modelling tool she adds the philtrum, that narrow central channel between the nose and upper lip, sketches in the upper lip and presses in just below the curve of the lower lip (Fig 12).
Filler injected into the philtrum and lower lip, to even out asymmetries.
The squint and her small eyes, together with a flat nose, thin top lip and no clear philtrum (the indent between the mouth and nose) are typical facial characteristics of foetal alcohol syndrome (FAS).
The respiratory and heart rates were 80/min and 160/min respectively, The patient had a flat midface, widely set eyes, mild ptosis, short philtrum and a triangular mouth; polythelia, foot and hand anomalies with clinodactyly were also noted (Fig.
These mice exhibited unique and in some cases opposing facial patterns, such as shortened upper lip, a present philtrum, and the brain, instead of appearing too narrow in the front, appeared wide.
These include microcephaly, short palpebral fissures, the long smooth philtrum and thin vermilion of the upper lip, joint anomalies, altered palmar crease pattern, and mental retardation.
The patient also exhibited the following physical findings: relative macrocephaly, a flat face with sparse eyebrows and long eyelashes, dysplastic ears with a preauricular skin tag on his left ear, anteverted nostrils, a long philtrum and thin upper and lower lips (Figure la).
Documentation of characteristic facial abnormalities (smooth philtrum, thin vermillion border, and short palpebral fissures) (see figure);
The facial phenotype is the only aspect of the syndrome that is considered specific to FAS; (6) short palpebral fissure length, smooth philtrum and midface hypoplasia are key components of the FAS diagnostic criteria.