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“dictionary” in Latin

The English word dictionary itself goes back to Latin dīcō, through dictiōnārium.

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

dictionary
lexicon (λεξικόν; alphabetical index, etc., of names and words): *onomasticon (ὀνομαστικόν; collection of words and names, arranged according to their subjects). ☞ Dictionarium belongs to the barbarous Latin of the Middle Ages. A copious dictionary, *thesaurus verborum: a small or pocket dictionary, *index verborum: to make a dictionary, lexicon condere, conficere; Ruhnken has *Latinae linguae thesaurum construere. I find him a walking dictionary, mihi, quoties aliquid abditum quaero, ille thesaurus est (Plin., Ep., 1, 22, 2).

Quick answer

What is the Latin word for dictionary?
The usual Latin words for “dictionary” 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.