The story
- Proto-Indo-European*h₁eh₂nos
- Proto-Italic*ānos
- Latinānus
- Proto-Indo-European*h₂el-
- Proto-Indo-European*h₂élisder.?
- Latinānālis
- English todayanal
Borrowed from Latin ānālis. By surface analysis, anus + -al. Psychological sense shortened from anal-retentive.
Etymology from Wiktionary, CC BY-SA 4.0.