LATIN DICTIONARYLexicon Latīnum
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“rein” in Latin

The English word rein itself goes back to Latin teneō, through retina.

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

rein s.
habena: lorum (frenum, usually plur., freni, or frena, bridle). To give the reins, habenam remittere (PROP. and figuratively); frenos dare (PROP. and figuratively, Cic.): to draw in or tighten the reins, habenam adducere (PROP. and figuratively).
rein v.
PROP., frenare, infrenare equum: frenos equo injicere (to put on the reins). To rein up, habenam adducere.
Figuratively, frenare: refrenare: coercere: continere: comprimere: reprimere; e.g., refrenare, coercere or reprimere cupiditates (libidines): moderari cupiditatibus: frangere cupiditates.

Quick answer

What is the Latin word for rein?
The usual Latin words for “rein” are habēna, lōrum, frēnum; also frēnō, refrēnō, coërceō. 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.