The English word crucial (1706, meaning cross-shaped) derives from the French crucial, which is actually a medical term for the ligaments of the knee, which cross each other. This came to us from the...
It's from the ancient Greek.
Homeo/homo means 'the same'. Like homosexual is liking the same sex.
Stasis means keeping still. Like stationary, static etc.
So homeostasis is keeping everything...