noun, masculine/ism/plural: isthmes
isthmus
Etymology tree Proto-Indo-European *h₁ey- Proto-Indo-European *h₁éyti Proto-Hellenic *éimi Ancient Greek εἶμῐ (eîmĭ) Ancient Greek ῐ̓σθμός (ĭsthmós)bor. Latin isthmuslbor. French isthme Learned borrowing from Latin isthmus, itself a borrowing from Ancient Greek ἰσθμός (isthmós).