The story
- Ancient Greekμόνος (mónos)
- Ancient Greekμονο- (mono-)
- Englishmono-
- Latinmōtor
- Middle Englishmotour
- Englishmotor
- English todaymonomotor
From mono- + motor, probably borrowed from Continental European applications; compare with French monomoteur.
Etymology from Wiktionary, CC BY-SA 4.0.