The story
- Proto-Indo-European*né
- Proto-Indo-European*n̥-
- Proto-Hellenic*ə-
- Ancient Greekἀ- (a-)
- Proto-Indo-European*temh₁-
- Ancient Greekτέμνω (témnō)
- Ancient Greek*τομός (*tomós)
- Ancient Greekἄτομος (átomos)
- Latinatomu
- Middle Frenchathome
- Middle Englishattome
- Englishatom
- Englishatomize
- English todayatomizer
From atomize + -er.
Etymology from Wiktionary, CC BY-SA 4.0.