[TA] the slight projection on the free edge of the center of the upper lip at the lower extent of the philtrum. Synonym(s): tuberculum labii superioris [TA], labial tubercle, procheilon, prochilon
tu·ber·cle of up·per lip
(tūbĕr-kĕl ŭpĕr lip) [TA] Slight projection on free edge of center of upper lip at lower extent of philtrum.