The Collaborative International Dictionary of English v.0.48:
Ruble \Ru"ble\, n. [Russ. ruble.] The unit of monetary value in Russia. [1913 Webster]WordNet (r) 3.0 (2006):
ruble n 1: the basic unit of money in Tajikistan 2: the basic unit of money in Russia [syn: ruble, rouble]