The story
- Proto-Indo-European*h₂ékʷeh₂
- Proto-Italic*akʷā
- Latinaqua
- Latinaquāticus
- Middle Frenchaquatique
- English todayaquatic
Borrowed from Middle French aquatique (“living in water”), from Latin aquaticus (“relating to water”), from aqua (“water”).
Etymology from Wiktionary, CC BY-SA 4.0.