LATIN DICTIONARYLexicon Latīnum
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“lexicon” in Latin

The English word lexicon itself goes back to Latin lexicon.

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

lexicon
*lexicon (λεξικόν, list of names and words in alphabetical order); *onomasticon (a collection of words and names arranged according to their matter: ☞ dictionarium, barbarous, of the Middle Ages). A large, copious lexicon, thesaurus verborum: a small lexicon, *index verborum: to undertake a Latin lexicon, lexici Latini curam suscipere: to write or compile a lexicon, *lexicon condere, conficere: he is to me a living lexicon, mihi, quoties aliquid abditum quaero, ille thesaurus est (Plin., Ep., 1, 22, 2).

Quick answer

What is the Latin word for lexicon?
The usual Latin words for “lexicon” are lexicon, cōnficiō, egō̆. 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.