ichneumon

The story

1. Ancient Greek · derived fromἰχνεύμων“tracker”
2. Latin · learned borrowing fromichneumōn
3. English todayichneumon

Learned borrowing from Latin ichneumōn, from Ancient Greek ἰχνεύμων (ikhneúmōn, “tracker”), from ἴχνος (íkhnos, “track, footstep”).