LATIN DICTIONARYLexicon Latīnum
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“loin” in Latin

The English word loin itself goes back to Latin lumbus, through *lumbea.

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

loin
lumbus; loins, plur., lumbi: weak in the loin, delumbis: elumbis (Festus): pain in the loins, lumborum dolores.

Quick answer

What is the Latin word for loin?
The usual Latin words for “loin” are lumbus, dēlumbis, ēlumbis; also fēstus. 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.