philtrum

Meanings

1. The shallow vertical groove running from the nasal septum to the center of the upper lip.
2. The junction between the two halves of an animal's upper lip or nose.

Etymology

Borrowed from the Latin philtrum (“a love potion”), from Ancient Greek φῐ́λτρον (phĭ́ltron, “a love charm; the dimple in the upper lip”). Doublet of philter.