isthmus

The story

1. Ancient Greek · derived fromῐ̓σθμός“neck, narrow passage”
2. Latin · borrowed fromisthmus“a strip of land between two seas”
3. English todayisthmus

Borrowing from Latin isthmus (“a strip of land between two seas”), from Ancient Greek ῐ̓σθμός (ĭsthmós, “neck, narrow passage”), possibly from εἶμῐ (eîmĭ, “to go”). Cognate to Old Norse eið (“isthmus”).