LATIN DICTIONARYLexicon Latīnum
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“straight” in Latin

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

straight adj.
Not crooked or curved, rectus (opposed to curvus, pravus): directus (in a straight line): libratus (horizontal): erectus (upright; e.g., incessus): aequus, planus (even, level). A straight line, linea directa: a straight road, via recta or directa: straight growth (of a person, tree, etc.), proceritas: to make straight what before was crooked, aliquid corrigere: to make a straight thing crooked, recta prava facere: to become straight, se corrigere.
Direct, right, Vid.
straight adv.
recta via: recta: recto itinere: recto.

Quick answer

What is the Latin word for straight?
The usual Latin words for “straight” are regō, dīrigō, lībrō; also ērigō, aequus, plānus. 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.