LATIN DICTIONARYLexicon Latīnum
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“precious” in Latin

The English word precious itself goes back to Latin pretium, through pretiōsus.

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

precious
Costly, sumtuosus: pretiosus: quod magni est pretii.
Excellent, pretiosus: egregius: praestans: excellens.
Precious stones: Vid: JEWEL.

Quick answer

What is the Latin word for precious?
The usual Latin words for “precious” are pretiōsus, ēgregius, praestō; also excellō. 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.