The story
- Proto-Indo-European*mel-
- Proto-Indo-European*ml̥tós?
- Proto-Italic*moltos
- Latinmultus
- Latinmultī
- Middle Englishmulti-
- Englishmulti-
- Englishdisciplinary
- English todaymultidisciplinary
From multi- + disciplinary.
Etymology from Wiktionary, CC BY-SA 4.0.