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“advertiser” in Latin

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

advertiser
index: delator (one who gives information to a magistrate: both often = proditor): nuncius (one who brings intelligence).
As name of a newspaper, the nearest expression, is acta diurna, orum.

Quick answer

What is the Latin word for advertiser?
The usual Latin words for “advertiser” are index, dēlātor, nūntius; also prōdō. 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.