LATIN DICTIONARYLexicon Latīnum
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“isthmus” in Latin

The English word isthmus itself goes back to Latin isthmus.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

isthmus
isthmus (Cic., De Fat., 1, 7): fauces (general term for narrow pass, etc.; e.g., Corinthus posita in angustiis atque in faucibus Graeciae, Cic.)

Quick answer

What is the Latin word for isthmus?
The usual Latin words for “isthmus” are isthmus, faucēs. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.