The story
- Latinpalpō
- Proto-Italic*ðrā
- Latinpalpebra
- Proto-Indo-European*h₂el-
- Proto-Indo-European*h₂élisder.?
- Late Latinpalpebrālis
- English todaypalpebral
Borrowed from Late Latin palpebrālis (“of or on the eyelids”), from palpebra (“an eyelid”) + -ālis (“-al”, adjectival suffix), equivalent to palpebra + -al.
Etymology from Wiktionary, CC BY-SA 4.0.