mentolabial sulcus

men·to·la·bi·al sul·cus

[TA] the indistinct line separating the lower lip from the chin. Synonym(s): sulcus mentolabialis [TA], mentolabial furrow

men·to·la·bi·al sul·cus

(mentō-lābē-ăl sŭlkŭs) [TA] Indistinct line separating lower lip from chin.