LATIN DICTIONARYLexicon Latīnum
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“dealer” in Latin

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

dealer
a dealer in anything, mercator alicujus rei (e.g., thuris Arabicorumque odorum, Plin., 6, 24, 26): qui commercium exercet alicujus rei (of articles of commerce; e.g., Hi primi commercium thuris fecere maximeque exercent, Plin., 12, 14, 30): qui venditat, etc., aliquid. A dealer in leather, *qui coria vendit or venditat; in dry goods, *qui merces ad ulnam vendit: a retail dealer; wholesale dealer [Vid. RETAIL, WHOLESALE].
Absolutely; institor (a retailer, or dealer in trifles going from house to house): mercator; negotiator (a merchant): tabernarius (if he keeps a shop): propola; caupo (both mere venders of different articles): nundinator (one who frequents the weekly markets).
A dealer at cards, *qui paginas dispertit: a careful dealer at cards, *aliquai paginas studiose dispertit.
To be a plain dealer with anybody, *sine fraude agere cum aliquo: a plain dealer, homo sine fuco et fallaciis; a double-dealer, fraudator: homo ad fallendum paratus or instructus; quadruplator: bilinguis (double-tongued): homo ad fraudem acutus; veterator; homo totus ex fraude factus (opposed to homo sine fuco et fallaciis): to be a double-dealer, totum ex fraude et fallacius constare, or (with reference to anybody), alicui fucum facere; aliquem fraude or dolo capere.
FIG., A dealer in anything (e.g., “these small dealers in wit and learning,” Swift), velut institor quidam alicujus rei (e.g., eloquentiae, Quint., 8, 3, 12); or institor alicujus rei only (e.g., ambitiosus institor eloquentiae, Quint. = ostentator, jactator).

Quick answer

What is the Latin word for dealer?
The usual Latin words for “dealer” are īnstitor, mercātor, negōtior; also tabernārius, propōla, caupō. 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.