The story
- Proto-Indo-European*h₁én
- Proto-Italic*en
- Proto-Italic*en-
- Latinin-
- Proto-Indo-European*kh₂eyd-
- Proto-Indo-European*kh₂éydeti
- Proto-Italic*kaidō
- Latincaedō
- Latinincīdō
- New Latinincīsor
- English todayincisor
Borrowed from New Latin incīsor, from Latin incīdō (“to cut into, cut through”) + -tor (“-er, -or”, agent noun suffix).
Etymology from Wiktionary, CC BY-SA 4.0.