Proto-Indo-European root meaning "to shine; white," hence "silver" as the shining or white metal.

It forms all or part of: argent; Argentina; argentine; Argo; argue; Argus; hydrargyrum; litharge.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit rajata-, Avestan erezata-, Old Persian ardata-, Armenian arcat, Greek arguron, Latin argentum, Old Irish argat, Breton arc'hant "silver;" Sanskrit arjuna- "white, shining;" Hittite harki- "white;" Greek argos "white."