LATIN DICTIONARYLexicon Latīnum
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“zodiac” in Latin

The English word zodiac itself goes back to Latin zōdiacus.

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

zodiac
orbis signifer (Cic., Div., 2, 42, 89): circulus signifer (Vitr., 6, 1, 1): circulus, qui signifer vocatur (Plin., 2, 4, 3); or simply signifer (id., 2, 10, 7): orbis in duodecim partes distributus (Cic., Tusc., 1, 2S, 68): orbis duodecim signorum (Cic., N.D., 2, 20, 53): limbus duodecim signorum (Varr., 2, 3, 7). ☞ The Greek Zodiacus is found only in later writers.

Quick answer

What is the Latin word for zodiac?
The usual Latin words for “zodiac” are circulus, signifer. 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.