The story
- Proto-Indo-European*h₂éd
- Proto-Italic*ad
- Proto-Italic*ad-
- Latinad-
- Latinhaereō
- Latinadhaereō
- Latinadhaerēns
- Old Frenchadherent
- Middle Englishadherent
- English todayadherent
From Middle English adherent, from Old French adherent, from Latin adhaerēns, present participle of adhaereō (“to stick to, cling”).
Etymology from Wiktionary, CC BY-SA 4.0.