peritrochium

The story

1. Ancient Greek · derived fromπερίτροχος“circular”
2. Koine Greek · derived fromπεριτρόχιον
3. New Latin · derived fromperitrochium
4. English todayperitrochium

From New Latin peritrochium, from Koine Greek περιτρόχιον (peritrókhion), from Ancient Greek περίτροχος (perítrokhos, “circular”).

First known use, by meaning

• 18th–19th c. The wheel which, together with the axle, forms the axis in peritrochio.