The story
- Proto-Indo-European*né
- Proto-Indo-European*n̥-
- Proto-Hellenic*ə-
- Ancient Greekἀν- (an-)
- Proto-Indo-European*h₂leg-der.?
- Ancient Greekᾰ̓́λγος (ắlgos)
- Ancient Greekἀλγέω (algéō)
- Ancient Greekἀνάλγητος (análgētos)
- Ancient Greekἀναλγησίᾱ (analgēsíā)
- New Latinanalgēsia
- English todayanalgesia
Learned borrowing from New Latin analgēsia. By surface analysis, an- + algesia.
Etymology from Wiktionary, CC BY-SA 4.0.