eustasy

The story

1. Ancient Greek · derived fromεὖ“well, good”
2. German · borrowed fromeustatische“eustatic”
3. English todayeustasy

A back-formation from eustatic (borrowed from German eustatische (“eustatic”), from Ancient Greek εὖ (eû, “well, good”) + στάσις (stásis, “standing”)) + -y.

Words from the same roots

First known use, by meaning

• from 1940s A worldwide change in sea level, especially one caused by melting ice or tectonic activity.