The story
- Proto-Indo-European*h₃emh₃-
- Proto-Indo-European*h₃emh₃-lo-s
- Proto-Italic*amlos?
- Proto-Indo-European*h₂ent-
- Proto-Indo-European*h₂énts?
- Proto-Indo-European*h₂m̥bʰí
- Proto-Italic*amβi-
- Latinambi-
- Proto-Indo-European*pleh₁-
- Proto-Indo-European*pl̥h₁nós
- Proto-Italic*plēnos
- Latinplēnus?
- Latinambiplus?
- Latinamplus
- Proto-Indo-European*dʰeh₁-
- Proto-Italic*θakos
- Latinamplificāre
- Old Frenchamplifier
- Middle Englishamplifiyen
- Englishamplify
- English todayamplifier
From amplify + -er.
Etymology from Wiktionary, CC BY-SA 4.0.