LATIN DICTIONARYLexicon Latīnum
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“mercury” in Latin

The English word mercury itself goes back to Latin merx, through mercurius.

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

mercury
The planet so called, Mercurius.
Quicksilver, argentum vivum (Plin., Vitr., in its natural state): hydrargyrus (Plin.): mercurius (technical term, prepared).
A plant, mercurialis (Linn.).
Mercury
Mercurius, -ii (m.); Hermes, -ae (m.); of or relating to Mercury, Mercurialis, -e; Hermaeus, -a, -um

Quick answer

What is the Latin word for mercury?
The usual Latin words for “mercury” are hydrargyrus, Mercurius, Mercuriālis; also Hermēs. 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.