What does ārgon mean in Latin?

ārgon, a noun, means “argon”.

What is the genitive of ārgon?

The genitive singular is ārgī. ārgon is neuter, second declension.

In classical Latin, [ˈaːr.ɡɔn]; in ecclesiastical (church) Latin, [ˈar.ɡon].

noun · neutersecond declension

ārgon n (genitive ārgī)

Classical[ˈaːr.ɡɔn]Ecclesiastical[ˈar.ɡon]

Borrowed from Ancient Greek ᾱ̓ργόν (ārgón), the neuter substantive form of ᾱ̓ργός (ārgós, “idle, lazy”) because of the element's inertness.