LATIN DICTIONARYLexicon Latīnum
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“nun” in Latin

The English word nun itself goes back to Latin nonna.

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

nun
monacha, nonna (Hier.); monastria (Justinus, Novell.): to become a nun, ritu Christiano sacrari cultui divino (after Ammianus, 18, 10).

Quick answer

What is the Latin word for nun?
The usual Latin words for “nun” are monacha, nonnus, Iūstīnus. 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.