LATIN DICTIONARYLexicon Latīnum
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“treasury” in Latin

The English word treasury itself goes back to Latin thēsaurus.

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

treasury
aerarium: thesaurus publicus (of the state): fiscus (of a prince). To lay up in the treasury, reponere pecuniam in thesauros, in thesauris: to bring into the treasury, pecuniam invehere in aerarium (Cic., Off., 2, 22, 76); ferre (Liv.) or referre (Cic.) in aerarium; pecuniam aerario conferre (Velleius): to exhaust the treasury, pecuniam ex aerario exhaurire (Velleius).

Quick answer

What is the Latin word for treasury?
The usual Latin words for “treasury” are aerārius, fiscus, ferō; also referō, Velleius. 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.