The story
- Proto-Indo-European*h₂ep-
- Proto-Italic*apeks
- Latinapex
- Englishapico-
- Proto-Indo-European*leb-
- Proto-Indo-European*l̥b-yóm
- Proto-Italic*labjom
- Latinlabium
- Proto-Indo-European*h₂el-
- Proto-Indo-European*h₂élisder.?
- Medieval Latinlabiālis
- Englishlabial
- English todayapicolabial
Etymology from Wiktionary, CC BY-SA 4.0.