Webster's Revised Unabridged Dictionary · 1913

Ruble

Ruble , noun

[Russ. ruble.]

The unit of monetary value in Russia. <-- and, 1917-1992, in the Soviet Union --> It is divided into 100 copecks, and in the gold coin of the realm (as in the five and ten ruble pieces) is worth about 77 cents. The silver ruble is a coin worth about 60 cents.