The story
- Proto-Indo-European*upó
- Proto-Italic*supo
- Latinsub
- Latinsub-
- Englishsub-
- Proto-Indo-European*sem-
- Proto-Indo-European*sm̥-
- Proto-Indo-European*smih₂
- Proto-Indo-European*ǵʰes-
- Proto-Indo-European*ǵʰéslom
- Proto-Indo-European*ǵʰéslih₂
- Proto-Indo-European*smih₂ǵʰéslih₂
- Proto-Italic*smīɣeslī
- Latinmīlle
- Frenchmilli-
- Englishmilli-
- Old Frenchseconde
- Middle Englishsecunde
- Englishsecond
- Englishmillisecond
- English todaysubmillisecond
From sub- + millisecond.
Etymology from Wiktionary, CC BY-SA 4.0.