LATIN DICTIONARYLexicon Latīnum
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“strait” in Latin

The English word strait itself goes back to Latin stringō, through strictus.

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

strait s.
A narrow part of the sea, fretum: euripus (the former the common and pure Latin word; the latter borrowed from the Greek; with the Greeks and Romans, also especially the straits between Euboea and Boeotia, now Golfo di Negroponte): fauces angustae or artae (a narrow channel); sometimes bosporus (e.g., bosporus Thracius, Cimmerius). The straits of Gibraltar, fretum Gaditanum or Herculeum.
Difficulty, Vid: STRAIT-WAISTCOAT, to put in a strait-waistcoat, constringere aliquem (Cic.). Ought not you to have a strait-waistcoat put on you? tu mentis es compos? tu non constringendus? (Cic., Phil., 2, 38, 97).

Quick answer

What is the Latin word for strait?
The usual Latin words for “strait” are fretum, eurīpus, artus; also Cimmerius, Herculeus. 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.